:00:16. > :00:17.Hello, Leah here with Wednesday's Newsround.
:00:18. > :00:18.First exciting news for dinosaur fans.
:00:19. > :00:22.Over 100 fossilised footprints have been found on the Isle of Skye,
:00:23. > :00:27.They're from the largest dinosaurs that ever lived, the sauropods,
:00:28. > :00:34.They lived at what was the the biggest dinosaur site in Scotland.
:00:35. > :00:36.We always want to find dinosaur bones, but sometimes people
:00:37. > :00:42.But in many ways footprints are more valuable.
:00:43. > :00:45.Records of dinosaurs moving around right here.
:00:46. > :00:51.So we can tell a lot about how big they were and how they moved.
:00:52. > :01:01.So what are the top five dinosaur discoveries that changed the world?
:01:02. > :01:06.Number one goes to the Megalosaurus Bucklandii, discovered
:01:07. > :01:10.It's a massive deal because it is a massive deal because
:01:11. > :01:14.it is the earliest discovered and scientifically analysed dinosaur.
:01:15. > :01:16.Although we have fossils of its bones, jaws and teeth,
:01:17. > :01:28.In at two is the Archaeopteryx lithographica, a fossil found back
:01:29. > :01:31.in 1860, by accident in a quarry in Germany with a crow sized body
:01:32. > :01:35.The fossil is a big deal because around the birds bones were
:01:36. > :01:38.It's the first evidence that birds and dinosaurs were close relatives.
:01:39. > :01:40.The diplodocus skeleton, discovered by a man called
:01:41. > :01:45.It's the biggest dinosaur in the world
:01:46. > :01:48.and he found a complete skeleton back in the 1890s in the USA.
:01:49. > :01:51.Carnegie made replicas of it and sent them to museums
:01:52. > :01:54.around the world, including one that's at the National History
:01:55. > :02:03.In at four is the Deinonychus antirrhopus, or Terrible Claw.
:02:04. > :02:10.This feisty fellow was discovered back in the 1960s America was the
:02:11. > :02:13.first time we realised that dinosaurs can be fast moving, highly
:02:14. > :02:16.Finally at five it's the Sinosauropteryx.
:02:17. > :02:23.In 1996 it was discovered in China, virtually complete.
:02:24. > :02:33.The most exciting part was the trace of a wispy fringe
:02:34. > :02:37.This led to the discovery that many dinosaurs were actually feathered
:02:38. > :02:41.Next to the superfast, prehistoric mega-shark called a megladon.
:02:42. > :03:00.Megladon millions of years ago and looked like a white shark but it was
:03:01. > :03:04.much heavier. Its teeth could grow up to 18 centimetres, roughly the
:03:05. > :03:10.size of my palm. Until now no one knew just how fast it was and it was
:03:11. > :03:14.one of the speediest in the sea. It swam at five metres a second, double
:03:15. > :03:19.the speed of the great white shark, the fastest land and oceans now. It
:03:20. > :03:24.is faster than a dolphin and its wings at 3.4 metres a second. The
:03:25. > :03:29.Greenland shark is the slowest swimming shark that covers three
:03:30. > :03:33.metres a second. It was bigger and heavier and had to swim faster to
:03:34. > :03:35.keep oxygen pumping around its body to survive.
:03:36. > :03:37.Now, who doesn't love an online cat video?
:03:38. > :03:40.We all do, and now they could soon also be big stars at the cinema too.
:03:41. > :03:43.With some films already shown in the UK and America,
:03:44. > :03:57.Colin Paterson's been finding out if it really is a purrfect idea.
:03:58. > :04:04.Thousands in a field watching cat videos. It was nice to know that I
:04:05. > :04:09.am not the only weirdo who sits on the Internet and watches animal
:04:10. > :04:15.videos. In Minneapolis there is now an international cat video Festival.
:04:16. > :04:20.There are all these good-natured people coming together to do
:04:21. > :04:24.something unbelievably ridiculous. It could become common in Britain.
:04:25. > :04:33.There have already been dedicated events in both Deptford and Glasgow.
:04:34. > :04:37.It is cats! I love cats. Not everyone is convinced these antics
:04:38. > :04:40.really belong on the big screen. My reservations are about why people
:04:41. > :04:45.would come out for something that is freely available online to them.
:04:46. > :04:49.With millions watching online every day and some Internet cats already
:04:50. > :04:53.having their own agents, it could be the likes of Angelina Jolie and Don
:04:54. > :04:54.-- Johnny Depp that will struggle for time at the local cinema.
:04:55. > :04:59.That's all from me and the Newsround team. Ayshah's back in the morning.