Episode 5 Nature's Weirdest Events


Episode 5

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We live in a very weird world.

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And the more we discover about our planet, the stranger it gets.

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Every day, new stories reach us, stories that surprise us...

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What is that?

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'..shock us...'

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-Whoa! That is so cool.

-Oh, my God!

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..and sometimes, even scare us.

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Argh!

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Oh, my God.

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We've scoured the globe to bring you the most curious creatures...

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..the most extraordinary people...

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I can stick almost anything to my skin without no glue.

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..and the most bizarre behaviour.

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Using eyewitness accounts and expert opinion to explore a weird world

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of unexplained underwater blobs,

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flying goats

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and glow-in-the-dark fish.

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We examine the evidence, test the theories,

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to work out what on earth is going on.

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In this episode - discover what made a monster wave

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appear out of nowhere.

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Oh, she's going.

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How vampires suddenly appeared in America's Great Lakes.

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And whether great white sharks really enjoy a bit of head-banging.

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And for our first dip into the world of weirdness,

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we head to the seaside.

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Australia, 2015.

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A group of friends decide to pack their swimming gear and head to

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some rock pools on the picturesque coast 50km south of Sydney.

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It was quite a nice day, probably high 20s, very clear,

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sunny, warm day.

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Nothing out of the ordinary, so it wasn't wild weather or anything

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like that, so it was quite a nice day

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to go for a walk and then a swim.

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Sun, warm seas and calm, crystal clear water.

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What could possibly go wrong?

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We put our things down and decided that we'd go in one at a time,

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so Mika went in first.

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We were watching, Alex and I were watching him in the distance.

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And then,

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all of a sudden, we saw a really, really big wave

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coming from the background...

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Oh, get out!

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..which completely shocked us and we were standing there

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screaming out to Mika.

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Before we knew it,

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he and countless other people were being dragged along the rocks.

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I have never seen anything like that first-hand and the force of it...

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The water reached us and we were metres and metres inland.

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I'd say it was probably two or three times higher than what I would have

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considered a big wave previously.

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The wave had taken everyone by surprise.

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And as the injured clambered their way back to the shore,

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the questions started flying.

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Everyone wanted to know where this freak wave had come from.

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And how could something like this appear from nowhere?

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Most of the waves that we see are either caused by swell or by wind

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blowing on the surface of the oceans.

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It's a bit like when I blow on this water, making the ripples.

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And of course, the stronger the wind, the bigger the waves.

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But here's the weird thing -

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on that day that Lisa and her friends

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decided to take a dip in the rock pools, there was no wind.

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It was perfectly calm.

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And weather can't change on a whim.

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On a calm day, all the waves would be small.

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And on a windy day, all the waves would be big.

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Not just one of them.

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So, if wind alone can't explain a single giant wave,

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did the blame lie with another force of nature altogether?

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When earthquakes happen near or under the sea,

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it triggers the mother of all monster waves - called a tsunami.

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In deep water, they're almost imperceptible.

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But a tsunami can cross entire oceans

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at speeds of up to 600mph.

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When they hit the shore, they slow down,

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allowing the fast-moving water behind to catch up and in this way,

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a huge wave can appear out of the blue.

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So, was this wave a tsunami?

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Well, no, it wasn't.

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You see, tsunamis are typically formed by seismic activity.

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They involve multiple waves and affect many miles of coastline.

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This wave was altogether different.

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It only affected a tiny part of the coast

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and it came and went very quickly.

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So, was it an anomaly, just a freak?

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Is that possible?

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Rogue waves, they're also called freak waves, extreme waves,

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giant waves. There's lots of different terminology for them,

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and essentially, they are waves that appear within a sea state

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unexpectedly, substantially taller than any of the surrounding waves.

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They are quite hard to predict.

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Rogue waves do quite often appear from nowhere.

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There's different causes that can make them appear,

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so they can occur in any sea state, essentially.

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So, the wave at the rock pools wasn't unique.

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Giant waves can appear anywhere.

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Understanding how could help prevent a disaster, but then,

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understanding anything called a rogue or a freak is complicated.

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Hmm, yes.

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But why is it so complicated?

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Well, firstly, it's because we are dealing with a liquid,

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and when you apply a force to a liquid, it changes shape,

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just like when I drop this marble in here.

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And at the point of the force touching the liquid,

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you can see the shape changing as those ripples radiate away.

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But how about if I apply multiple forces at the same time?

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Then what we've got is, effectively, chaos,

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with the ripples radiating from each one of those marbles,

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but also what we have is an enhanced probability that some

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of those ripples will meet...

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..to form waves, which are double the height of his single ripple.

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And basically, that's how we get rogue waves.

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Only the world isn't a fish tank.

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Our oceans are massive and cover 70% of the planet.

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Instead of lots of marbles, they have storms,

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all happening independently and separated by vast distances.

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Each storm creates waves that can travel for miles.

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When two of these waves meet, they can form a bigger wave,

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but there's more.

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Surging currents and an undulating sea floor also play a part.

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When all of these elements come together...

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..a rogue wave can form,

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and that's what happened at the rock pools that day.

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Scientists know what ingredients are needed to make a rogue wave,

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but they just can't yet predict them.

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To work out the recipe, they need to analyse vast amounts of data,

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but the hope is that one day maths will provide the answer.

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Our oceans are phenomenal places.

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The sheer size and power can be intimidating.

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But, that said,

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I wouldn't let a rogue wave put you off from taking a dip in the sea.

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After all, these are rare events.

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The clue is in the name.

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From stories of weird and wonderful weather,

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we now head off to meet some of nature's ultimate survivors.

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These are North America's Great Lakes.

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It looks placid here,

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but there's something sinister lurking beneath the surface.

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The Great Lakes fish are under attack from an animal

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that's scraping away their flesh to feed on the blood.

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Millions of fish have already died, which in turn,

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has caused panic in the fishing community.

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You'd see warnings from fishermen, say,

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out on Lake Michigan telling the people at Lake Superior,

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"Man, look at what happened to us down here."

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I hate to say it, but there's nothing that can be done to stop

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these and your way of life is in danger as well.

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People were determined to find out what was killing the fish.

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And what they discovered caused alarm.

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They found a bloodsucker

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that's been around since the time of the dinosaurs.

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A fish, albeit a very weird one, called a sea lamprey.

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So, this is a sea lamprey, it looks like an eel.

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They're not eels actually, they're their own family.

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A lamprey has a mouth that's suited to nothing better than feeding.

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It's a suction cup, so it's as strong as a suction cup.

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The mouth is ringed with sharp teeth and the middle of the mouth is a

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file-like tongue that flicks its way through the scales and skin of

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a fish, so that the lamprey is able to

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feed on the blood and body fluids of that fish.

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It'll go through about 40 pounds of fish during

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that parasitic phase, before it moves into a stream

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to spawn once and die.

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But why was a prehistoric predator suddenly inflicting its death hickey

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on the Great Lakes' fish?

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Sea lampreys are normally found here,

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down the Atlantic coast of North America.

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So, how on earth did they end up all the way inland over here?

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The Niagara Falls are an impassable natural obstacle.

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And they are the only thing stopping lampreys

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getting beyond Lake Ontario.

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Until we stepped in.

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In the 1920s, engineers opened the Welland Canal,

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linking Lake Ontario to Lake Erie.

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On the one hand, it was a great success -

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allowing ships to bypass the Niagara Falls, but on the other,

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it was a disaster, which opened the floodgates for lampreys.

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Lamprey made it past Niagara Falls in about 1920

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and made it all the way to Lake Superior by about 1939.

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Only 20 years after the new canal was opened,

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the lamprey had successfully invaded the entire Great Lakes Basin.

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It was a perfect storm for invasion.

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They had an almost unlimited food supply, because there was abundant,

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succulent, tasty fish for the lamprey in the Lakes

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and there is nothing preying upon lamprey

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or keeping the lamprey in check.

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It was a free, open buffet for the sea lamprey.

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Plenty of food, perfect spawning grounds, no natural predators.

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The lampreys had slithered their way into paradise.

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Yes! Or, no.

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You see, for the people of the Great Lakes, these things were killers.

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A menace that had to be dealt with.

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So, whilst the rest of the world were gearing up for the Cold War,

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these folks were involved in a fishy fracas.

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And to show you how bad it got - prior to the lamprey invasion,

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the harvest of fish in Lake Michigan

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and Huron was about 20 million pounds annually.

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After the lamprey invasion,

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that fell to only a few hundred thousand pounds

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and that happened over the course of a relatively

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short amount of time.

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The lampreys were guzzling fish

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faster than a sea lion at a sushi bar.

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They were that bad.

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They were taking five times the amount of fish that humans

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were harvesting.

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It was make or break time.

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They had to find a way to bring this destructive predator under control.

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So, they threw everything at it.

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Starting with barriers and traps.

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They had to prevent the lampreys reaching

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or leaving their spawning grounds.

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When the traps on their own failed, they tried adding electricity.

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Unfortunately, some of those early attempts at lamprey control

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were quite... They were abject failures, actually.

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And in fact, some of the electrical barriers were very rudimentary,

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not much different, some say, than just throwing your toaster

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in the river and zapping whatever happens to be in there.

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So, the scientists switched to chemical warfare

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and developed a weapon that

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could kill lamprey without harming any other wildlife.

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A chemical called lampricide was the biggest breakthrough in the war

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against the lampreys yet.

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But the scientists couldn't rest on their laurels.

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At any point, the lampreys could develop a resistance to it.

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So, they'd won a battle, but to win the war,

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they'd have to exploit the lampreys' natural senses.

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The sea lamprey has a very refined sense of smell. In fact,

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most of their brain is for olfactory purposes.

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We call them swimming noses, because they're, basically,

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they have a very refined sense of smell.

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The scientists found that female lampreys

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are attracted to males by smell.

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So, they isolated the chemical responsible.

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Known as a pheromone,

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it was male lamprey cologne and it drove lady lampreys wild.

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This pheromone could be used to hoodwink the females

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into going into traps on the promise of a bit of hanky-panky.

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But there was even better news.

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You see, the scientist had managed to isolate the polar opposite

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to this attractant.

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A naturally occurring chemical called a necromone,

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a sort of eau de death,

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and the lampreys will do absolutely everything

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to avoid this death smell.

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Using these natural chemicals,

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scientists hope to create a push and pull effect,

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using necromones to push lamprey away from places

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they don't want them to be, like streams,

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with great spawning habitat, and pheromones to pull them into traps.

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By turning their own senses against them,

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scientists finally had this slippery customer under control.

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We've gone from about two million lamprey in the Great Lakes

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to only a few hundred thousand,

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and that's a significant drop in the lamprey numbers.

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It certainly is.

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But you have to give respect where it's due.

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This brilliant parasite,

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with its efficient if disturbing means of survival,

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has been giving human beings the run-around

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for almost 100 years.

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Since 1957, we've probably spent about 800 million or 900 million

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to control lamprey. But contrast that to the fact

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that the Great Lakes' fishery is worth 7 billion every year to

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the people of the US and Canada, and you can see it's a small price

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that we pay to have the fishery that we have.

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Without the sea lamprey control programme,

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we have no fishery to speak of.

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Those lampreys almost ruined the Great Lakes fishery.

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I've got to say, they got us out of a bit of a jam.

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You see, there's a long-held tradition in the UK

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that on the occasion of their jubilee,

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the reigning monarch is given a lamprey pie,

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except that here, lampreys are an endangered animal.

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But thankfully, the Canadians sent some over.

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And on the 60th anniversary of her reaching the throne,

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Queen Elizabeth was thus presented with a lamprey pie.

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History does not recount whether she ate it or not.

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Our next event takes place in the marshlands of the Negev desert

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in Israel, where a battle of a different kind is raging.

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Something here has an unhealthy appetite for toads and frogs -

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and not just their legs.

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Half-eaten amphibians are cropping up all over the place.

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But what's causing the slaughter?

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Well, a bizarre clue was discovered by a team of entomologists in 2005.

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What we found first were several toad specimens

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that were carrying larvae on their bodies.

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And because no-one had seen this before,

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at least in Israel,

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we didn't know what they are, so we took them to the lab.

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At first, we thought that this was completely incidental,

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that they were just larvae accidentally attached to the toads

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and we were sure that they would just drop off after a few hours.

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Gil and his team decided to keep the amphibians under observation,

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and they didn't have to wait long

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before they made a macabre discovery.

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The researchers couldn't believe their eyes.

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The larvae weren't just hitching a ride,

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they were attacking their amphibian hosts.

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Only after we kept the toads and the larvae in the lab for a while,

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we noticed that the larvae kill the frogs.

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Frog after frog fell foul to their surprising assassin.

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It was clear that this was no accident of fate.

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When we thought that they are actually feeding on the toads,

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and they just didn't drop off, we said,

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"OK, this is something interesting. We should check it out."

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Things just didn't add up.

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Anything that's small and moving is normally fair game to an amphibian.

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The beetle larvae should be an easy meal,

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so how has this grisly grub turned the tables?

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Gil and his team had to find out.

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So, we went back to the field to collect more adults and more frogs

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carrying larvae to bring them back into the lab.

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Eventually, the larvae will complete their life cycle

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or complete the developmental stage.

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They will pupate and become beetles, and we wanted to know

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what these beetles were.

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So, would this bizarre larvae emerge from its pupae

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as a grotesque adult beetle? Well, actually, no.

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It hatches out as a rather plain ground beetle.

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It's always the quiet ones, isn't it?

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This unassuming arthropod goes by the name of epomis circumscriptus.

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But why had such ordinary-looking beetles

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produced such diabolical babies?

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Well, Gil has a theory.

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We think that it evolved from some sort of counterattack,

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as some sort of defence.

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And throughout time,

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these larvae learned to utilise amphibians as food

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and started feeding on them and eventually,

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they just stopped feeding on everything else

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and fed exclusively on amphibians.

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The larvae weren't just fighting back any more,

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they were actively inviting the attack,

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and in a truly remarkable way.

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It uses very minute behaviour,

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very minute movements to lure amphibians towards it.

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It moves its antennae and mandibles in a repeated cycle

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that entices the amphibians to approach and even to attack.

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By acting like a tasty snack,

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the epomis larvae had managed to turn

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the amphibian's own hunting instincts against them.

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And then it uses its double-hook mandibles to attach

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to the amphibian's body, to lock onto the skin.

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Once it is attached,

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it starts feeding on the amphibian's body fluids.

0:23:200:23:23

And what's absolutely extraordinary is that a single greedy grub

0:23:230:23:29

can chomp its way through nine frogs before it is ready to pupate.

0:23:290:23:33

A dead frog looks like...

0:23:360:23:40

Well, it doesn't look like a frog at all.

0:23:400:23:42

It looks like a pile of bones,

0:23:420:23:45

like someone just ate all the fleshy parts of the frog, the eyes,

0:23:450:23:48

some of the skin, and you get this almost perfect skeleton of bones.

0:23:480:23:53

Sometimes it's a complete skeleton, sometimes it's just a pile of bones,

0:23:530:23:56

with no shape at all.

0:23:560:23:58

It's easy for us to see the frogs and toads as the victims here.

0:24:040:24:08

But you've got to remember that

0:24:080:24:10

during the course of their lifetimes, they eat thousands

0:24:100:24:14

of insects without ever thinking about it.

0:24:140:24:17

And the epomis beetle is the only species

0:24:170:24:19

we've seen that completely reverses the predator prey role.

0:24:190:24:25

So, it's unique and extremely weird.

0:24:250:24:29

For our next story, we head north to the Arctic Ocean,

0:24:330:24:38

where there's weirdness in abundance.

0:24:380:24:41

Living amongst the sea ice are some of our planet's strangest animals.

0:24:460:24:51

And perhaps oddest of all is the Greenland shark.

0:24:540:24:58

At up to six metres long,

0:25:010:25:03

Greenland sharks rival great whites in terms of size.

0:25:030:25:07

But in comparison, very little is known about them.

0:25:070:25:11

They live at amazing depths,

0:25:120:25:15

often below the level that light can penetrate.

0:25:150:25:18

So, not only are they hard to find,

0:25:200:25:22

it's also a dangerous place to study them.

0:25:220:25:25

But sometimes, these sharks are accidentally caught by fishermen.

0:25:270:25:31

So, a team of marine biologists

0:25:330:25:35

decided to make the most of a bad situation.

0:25:350:25:39

In 2010, they set off in Denmark to investigate.

0:25:420:25:46

Over the next three years,

0:25:470:25:49

they would study every shark that they could get their hands on.

0:25:490:25:53

Samples were frozen, so they could be examined later, back in the lab.

0:26:050:26:10

The team didn't know it yet,

0:26:120:26:14

but one of their discoveries would change the face of biology.

0:26:140:26:18

No-one knew how long these remarkable animals live.

0:26:230:26:28

Because sharks have a skeleton made of cartilage rather than bone,

0:26:290:26:33

the usual method of carbon dating doesn't work.

0:26:330:26:36

The biologists had to find another way of ageing them

0:26:380:26:41

and they found the answer they were looking for in a remarkable place.

0:26:410:26:45

The shark's eye contains proteins formed when it was an embryo.

0:26:490:26:55

These can be carbon dated,

0:26:550:26:58

so a sample was sent back to the lab and this was the chance to finally

0:26:580:27:03

age these mysterious animals.

0:27:030:27:05

When the results were analysed,

0:27:080:27:10

the oldest shark was shown to be somewhere between 272

0:27:100:27:16

and 512-years-old.

0:27:160:27:20

Now, even if we plumped for somewhere

0:27:200:27:22

in the middle of that range,

0:27:220:27:23

that means there could be a shark living today

0:27:230:27:26

that was born on the same day as Isaac Newton,

0:27:260:27:29

that lived through the Great Fire of London,

0:27:290:27:32

the English Civil War.

0:27:320:27:34

There could be a shark out there that remembers

0:27:340:27:37

England winning the World Cup!

0:27:370:27:41

A shark hundreds of years old is extraordinary in itself.

0:27:410:27:45

But this miraculous life-span is even more impressive

0:27:450:27:49

when you realise what these deep sea survivors are up against.

0:27:490:27:52

I would say they're living on the edge the whole time,

0:27:560:28:00

in terms of tolerating the extremes of the cold,

0:28:000:28:04

the extremes of pressure that they inhabit, and also,

0:28:040:28:08

actually finding the food that they need

0:28:080:28:11

just for their general life and routines.

0:28:110:28:14

So, it's literally a life of searching for food

0:28:180:28:22

in a very hostile environment.

0:28:220:28:26

Surviving in the cold and dark is impressive enough,

0:28:260:28:29

but there's another bizarre twist to this tale.

0:28:290:28:32

If you're searching for food in an environment like this,

0:28:350:28:38

it would pay to have pretty good eyesight and I've got to tell you

0:28:380:28:41

that when Greenland sharks are born they do have

0:28:410:28:44

a perfectly respectable set of peepers.

0:28:440:28:47

In fact, they've got larger eyes than most other species of shark,

0:28:470:28:51

but as they grow up, something very weird happens.

0:28:510:28:56

One of the amazing points of the Greenland shark,

0:29:000:29:04

a very unique characteristic that we don't see

0:29:040:29:07

in any other shark species,

0:29:070:29:08

is a parasitic copepod that is embedded into the eyes

0:29:080:29:14

of this particular species, and this is extremely common,

0:29:140:29:18

particularly in the mid to high Arctic.

0:29:180:29:21

All of the Greenland sharks that you'll encounter

0:29:210:29:24

have this particular parasite that's embedded into the eye.

0:29:240:29:30

Copepods are tiny crustaceans.

0:29:300:29:32

Most are drifters and spend their lives hanging out in the plankton.

0:29:320:29:37

But one, called Ommatokoita, has decided to settle down

0:29:370:29:42

on the Greenland shark's eyeball.

0:29:420:29:45

The parasitic copepod actually anchors right inside

0:29:460:29:51

the central part of the eye.

0:29:510:29:54

It's got an anchor system, which is called a bulbar, that locks into

0:29:540:29:58

the eye, and the thought is that the parasite actually feeds off

0:29:580:30:04

the surface of the eye itself.

0:30:040:30:06

So, how does a blind shark survive in these Arctic conditions

0:30:070:30:12

for hundreds of years?

0:30:120:30:15

Well, it appears that it might benefit

0:30:150:30:17

from the misfortune of others.

0:30:170:30:19

We assume the Greenland shark is a scavenger and it is thought that

0:30:210:30:26

it obtains most of the larger prey items from dead animals

0:30:260:30:29

that have fallen to the sea floor.

0:30:290:30:32

And therefore, if you're going to feed in that particular way,

0:30:320:30:36

you obviously need an extraordinarily good

0:30:360:30:38

sense of smell to be able to navigate around

0:30:380:30:41

and locate those food falls.

0:30:410:30:44

Although the Greenland shark has large eyes and they're potentially

0:30:440:30:47

adapted in some way for these very low light levels,

0:30:470:30:51

I think that the Greenland shark is not majorly dependent

0:30:510:30:56

on vision as a cue to locate prey.

0:30:560:30:59

Ladies and gentlemen, I give you the Greenland shark.

0:31:070:31:11

What an animal. What an animal!

0:31:110:31:14

Not only can it lose its vision and live on for hundreds of years,

0:31:140:31:18

it's probably the oldest living vertebrate on planet Earth.

0:31:180:31:24

It has to be nature's greatest survivor.

0:31:240:31:28

We've seen how animals can adapt and survive,

0:31:320:31:35

even in the most extreme situations.

0:31:350:31:39

But next up, we meet a man who has to cope

0:31:390:31:43

with his own rather surreal senses.

0:31:430:31:46

Englishman James Wannerton doesn't just see the world differently

0:31:490:31:53

to most of us, he tastes it.

0:31:530:31:55

What happens is I get one of my senses stimulated, my hearing,

0:32:000:32:05

and that immediately gets translated into a taste for me.

0:32:050:32:08

It's a real mouth thing as well, it's not, not an association.

0:32:120:32:15

It's actually a mouth thing. It's as if I'm actually eating something.

0:32:150:32:19

Yes, James can taste words.

0:32:190:32:22

And what's more, he's had this peculiar ability since childhood.

0:32:220:32:26

I used to go on the tube train with my mum and I used to read off

0:32:290:32:34

the names of the stations as we passed through them,

0:32:340:32:36

and each of the stations had

0:32:360:32:38

a unique and distinct taste and texture.

0:32:380:32:41

We used to travel on the Central line, which was my tastiest line,

0:32:410:32:46

it was lovely. Not all these tastes are nice,

0:32:460:32:48

there were a few stations that were pretty horrible.

0:32:480:32:50

Bond Street is one. It's got the taste and texture of

0:32:500:32:53

something similar to hair spray.

0:32:530:32:55

Tangy.

0:32:550:32:57

It's horrible.

0:32:580:33:00

Most people's senses work independently,

0:33:010:33:04

so why is James' sense of taste triggered by the sound of a word?

0:33:040:33:08

Could it be something to do with the one organ that has to interpret

0:33:100:33:14

everything that we see, hear, taste, touch and smell?

0:33:140:33:18

Imagine that this is my brain.

0:33:200:33:23

It allows me to get around and make sense of the world and each part of

0:33:230:33:28

that brain is ascribed a specific task

0:33:280:33:31

and you need all of those parts for it to function properly.

0:33:310:33:34

Let's imagine that the lemon is damaged in an accident,

0:33:350:33:39

then I may not be able to recognise myself in a mirror.

0:33:390:33:43

And if the apple becomes diseased,

0:33:430:33:46

I then think that my left hand belongs to someone else.

0:33:460:33:50

Now these are not amusing anecdotes,

0:33:500:33:53

these are neurological conditions

0:33:530:33:55

that have been recorded by doctors and what they tell us is that when

0:33:550:34:00

the brain is damaged, things get taken away.

0:34:000:34:04

But in James' case it's not about being taken away,

0:34:040:34:08

it's that he's got extra perceptions.

0:34:080:34:12

So, is it a case that James' brain, effectively,

0:34:120:34:16

has more fruit not less?

0:34:160:34:18

To the best of our knowledge, there seemed to be perhaps extra

0:34:210:34:25

or strengthened connections between the area of his brain that processes

0:34:250:34:29

words and the area that processes tastes.

0:34:290:34:32

And there are neurons firing from the word portion of his brain to

0:34:360:34:41

the taste portion of his brain

0:34:410:34:42

and that causes him to have this extra perception.

0:34:420:34:46

So, James' brain doesn't have extra fruit,

0:34:460:34:49

just extra connections between the fruit and this allows some of

0:34:490:34:54

his senses to talk to each other.

0:34:540:34:56

It's like an eye dropper of taste, you know, just drops.

0:34:560:34:59

Just drip-drops, one after the other...

0:34:590:35:01

-HE IMITATES EYE DROPS FALLING

-..for every single sound I hear.

0:35:010:35:04

This fantastic neurological phenomenon is called synaesthesia.

0:35:040:35:11

The vast majority of the synaesthetic tastes

0:35:110:35:14

that I experience are from childhood. A lot of them are sweets,

0:35:140:35:19

things like wine gums and sweets you can't buy any more.

0:35:190:35:24

So, does James' childhood offer a clue to where

0:35:240:35:26

his curious condition came from?

0:35:260:35:30

So, the general idea is that perhaps synaesthetes have some

0:35:320:35:37

genetic difference that causes either extra connections

0:35:370:35:43

or a lack of pruning of connections.

0:35:430:35:45

So, when we're born, we have lots of neural connections

0:35:450:35:50

and throughout time, those neural connections get pruned down

0:35:500:35:54

to the ones that are meaningful for us.

0:35:540:35:57

In every newborn baby's brain,

0:35:580:36:00

represented by this bunch of bananas,

0:36:000:36:03

the senses are better connected.

0:36:030:36:06

But we don't need all of these connections to understand the world,

0:36:060:36:10

so gradually, one by one, they are severed.

0:36:100:36:15

The difference, however, with James' brain is that

0:36:150:36:18

one of these connections remains intact,

0:36:180:36:20

the one between the piece that processes words

0:36:200:36:23

and the piece that processes tastes.

0:36:230:36:27

And that is mind-boggling.

0:36:270:36:29

So, what if some brilliant brain surgeon discovered a way of snipping

0:36:310:36:36

James' extra neural connections now,

0:36:360:36:40

freeing him from these strange synaesthetic sensations forever?

0:36:400:36:44

Would he do it?

0:36:440:36:47

I couldn't imagine life without it.

0:36:470:36:48

And I think most synaesthetes would say the same.

0:36:480:36:51

Fantastic. And although this might read as faulty wiring,

0:36:530:36:57

in my opinion, this is as close as a human can come

0:36:570:37:01

to having a proper superpower,

0:37:010:37:04

so I couldn't resist asking James what my name tasted like.

0:37:040:37:09

Do you know what he said?

0:37:090:37:10

Soggy crisps.

0:37:120:37:13

Soggy crisps!

0:37:130:37:15

So much for the superpower.

0:37:150:37:17

For our next sensational story,

0:37:210:37:23

we head to the coast of south-west Australia.

0:37:230:37:27

This is a favourite spot for shark lovers from all over the world.

0:37:270:37:32

And there is no bigger draw than a great white.

0:37:320:37:36

But the traditional method of baiting them in with a bag of fish

0:37:360:37:40

body parts can put sharks in a bit of a frenzy.

0:37:400:37:44

And with water sports enthusiasts all along the coast,

0:37:450:37:48

the last thing the authorities want to do here is put sharks

0:37:480:37:52

in any kind of frenzy.

0:37:520:37:54

So, when they stopped issuing licences to bait sharks,

0:37:540:37:58

one tour operator had to get creative.

0:37:580:38:02

Necessity is the mother of invention.

0:38:020:38:04

When we started shark cage diving,

0:38:040:38:06

initially we weren't allowed to use blood and bait, so we looked for

0:38:060:38:10

alternatives around other senses that could attract sharks

0:38:100:38:15

and music or acoustics was just an obvious thing to try.

0:38:150:38:20

We may think it's rather quiet underwater,

0:38:210:38:24

but in fact lots of marine animals use sound to communicate.

0:38:240:38:28

But using music to attract sharks,

0:38:290:38:31

where on earth you begin?

0:38:310:38:33

So, when we first trialled this

0:38:390:38:43

we just, we grabbed the speaker off one of my mates and we went down,

0:38:430:38:47

we put it in the water, connected it to the iPod,

0:38:470:38:49

it was my iPod and we just started at A.

0:38:490:38:52

Now, I'm a country Aussie kid,

0:38:520:38:55

I only have one type of music and it's usually Aussie rock,

0:38:550:38:57

so the first album on the list was AC/DC - Back In Black.

0:38:570:39:00

When we turned it on, we had sharks within a minute

0:39:000:39:03

and they hung around for 20 minutes.

0:39:030:39:05

And the sharks were coming up and just rubbing their face on

0:39:050:39:08

the speaker and we were just like, "This is the coolest thing ever."

0:39:080:39:12

Come on, come on.

0:39:150:39:17

Even if we do away with the stereotypes of the long greasy hair,

0:39:170:39:21

the patch-covered denim jackets and the head-banging,

0:39:210:39:24

I just can't see sharks as heavy metal fans.

0:39:240:39:28

So, was Matt's experiment a bit of a freak, a one-off,

0:39:280:39:31

or do these animals truly have an appreciation of music?

0:39:310:39:36

He was about to find out.

0:39:360:39:37

Within days of the story hitting social media,

0:39:410:39:44

Matt was inundated with requests to try other music.

0:39:440:39:48

We started going through the playlist and what we saw is that it

0:39:490:39:52

wasn't just AC/DC that attracts sharks,

0:39:520:39:54

there were other songs as well.

0:39:540:39:55

We got to one particular shark, Bernadette I think her name was,

0:39:550:39:59

that every time we played Talking Heads - Sax And Violins

0:39:590:40:03

she would breach out of the water.

0:40:030:40:07

The only time we'd see this shark is when that song was playing and we

0:40:070:40:10

started to think that maybe sharks had individual preferences.

0:40:100:40:14

Matt now had proof that his experiment worked.

0:40:140:40:18

The one big question remaining was why?

0:40:180:40:21

A lot of species of sharks, like white sharks,

0:40:220:40:24

that live in open ocean, or in the pelagic environment,

0:40:240:40:28

because of the low rate of encounter of prey, potential prey,

0:40:280:40:33

you would expect them to react and to investigate any kind of stimulus.

0:40:330:40:37

So, if there is a sound or a smell that they encounter,

0:40:370:40:41

because they are curious animals,

0:40:410:40:43

they are likely to go and check out what is producing that sound,

0:40:430:40:47

as it could potentially be a prey item.

0:40:470:40:49

The sharks appeared to enjoy a wide musical repertoire,

0:40:520:40:55

but the tracks that worked best had something in common -

0:40:550:41:00

a driving bassline.

0:41:000:41:03

Low-frequency sounds travel a long way underwater

0:41:060:41:09

and it's just possible that sharks can mistake them

0:41:090:41:12

for the death throes of an injured fish.

0:41:120:41:14

That's because they don't just hear sound, they feel it.

0:41:160:41:21

You see, in sharks,

0:41:230:41:24

hearing and vibration detection are fundamentally linked.

0:41:240:41:28

A fluid-filled tube call the lateral line extends along each flank.

0:41:280:41:35

This tube is in direct contact with the water,

0:41:380:41:41

via tiny holes in the skin.

0:41:410:41:43

When sound causes the water to vibrate,

0:41:460:41:49

it moves tiny hairs inside the lateral line

0:41:490:41:52

and this tells the shark which direction it came from.

0:41:520:41:56

Rock and roll, it does have the largest success probably,

0:41:590:42:02

because of the lower down frequency vibrations, the bass beat.

0:42:020:42:06

And even the distortion.

0:42:060:42:07

It might have something to do with replication of a feeding behaviour,

0:42:070:42:11

we don't know, but when a shark comes back to the same song,

0:42:110:42:16

time after time, knowing that there's no food available,

0:42:160:42:19

what is the attraction? Maybe they just think it's cool.

0:42:190:42:24

Sitting underwater,

0:42:240:42:26

listening to your favourite song by Metallica and having a shark just

0:42:260:42:29

cruise past, looks like he's rocking out to the beat,

0:42:290:42:32

letting his hair down and just kicking back with the tunes.

0:42:320:42:35

Shark music.

0:42:420:42:44

I absolutely love it, because it gives us the opportunity

0:42:440:42:47

to redefine the great white as something which isn't a purely

0:42:470:42:52

psychopathic fish and it gives people the ability to engage with

0:42:520:42:56

this animal in a relatively nonintrusive way.

0:42:560:43:00

It's genius. Utter genius.

0:43:000:43:02

There's just one thing, I so wish they'd been into The Ramones.

0:43:020:43:06

From a man with a finger-licking lexicon...

0:43:100:43:13

Tastes horrible.

0:43:130:43:15

..to a shark with an appetite for music,

0:43:150:43:19

we've seen how the senses can perplex

0:43:190:43:21

and please us in equal measure.

0:43:210:43:23

From frogs to fish to beetles to humans, weirdness has no boundaries.

0:43:260:43:33

It comes in all shapes and sizes.

0:43:330:43:36

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