0:00:13 > 0:00:15It's Saturday, I'm Jenny and it's another big weekend
0:00:15 > 0:00:18of sporting action - first up, it's the Six Nations.
0:00:18 > 0:00:21And one of the tournament's biggest games takes place later -
0:00:21 > 0:00:23Wales take on England in Cardiff.
0:00:23 > 0:00:27It's the 130th time they've played.
0:00:27 > 0:00:29Last week, Wales beat Italy and England squeezed past
0:00:29 > 0:00:29France to keep up their 15 match winning run.
0:00:34 > 0:00:37Here's the Welsh captain, Alan Wyn Jones.
0:00:37 > 0:00:40You come out and you've got 75,000 fans that
0:00:40 > 0:00:42are there for what's hopefully
0:00:42 > 0:00:46going to be a good 80-minute game.
0:00:46 > 0:00:50You realise you're in a very fortunate place and you get to enjoy
0:00:50 > 0:00:53the anthem before the game.
0:00:53 > 0:00:56Hopefully we can put smiles on faces.
0:00:56 > 0:00:59And we want to know what you think will happen.
0:00:59 > 0:01:00Can England keep their winning record going
0:01:00 > 0:01:02or will Wales beat them?
0:01:02 > 0:01:07Go online and let us know.
0:01:07 > 0:01:10Volunteers in New Zealand have managed to re-float about 100
0:01:10 > 0:01:13of the 400 pilot whales that became stranded on beaches on Friday.Sadly
0:01:13 > 0:01:16many whales have died and it's thought another 200 many have
0:01:16 > 0:01:18got stuck overnight.
0:01:18 > 0:01:21It's the worst case of this type the country has ever seen.
0:01:21 > 0:01:23It's not uncommon for these animals to become beached like this.
0:01:23 > 0:01:25But why does it happen?
0:01:25 > 0:01:26Here's what you need to know.
0:01:26 > 0:01:29Beaching is when whales become stuck on sand and it can be very
0:01:29 > 0:01:30dangerous.
0:01:30 > 0:01:33Marine scientists then have one clear reason to explain why
0:01:33 > 0:01:34it happens.
0:01:34 > 0:01:35Here are some of the theories.
0:01:35 > 0:01:37It's thought some whales become stranded because they are
0:01:37 > 0:01:41sick or injured and are pushed in shore by currents, or are simply too
0:01:41 > 0:01:48ill to swim.
0:01:48 > 0:01:51Whales rely on something called sonar to work out
0:01:51 > 0:01:53where they are and where they are going.
0:01:53 > 0:01:55They send sound waves or pulses which bounce back of surfaces.
0:01:55 > 0:01:57Some ships use of sonar pulses, too.
0:01:57 > 0:01:59They have been linked to whales getting stranded because
0:01:59 > 0:02:01scientists think if the two crossed paths, the whales could become
0:02:01 > 0:02:08confused or injured.
0:02:08 > 0:02:10It's thought changes in the environment could
0:02:10 > 0:02:13cause them to behave differently, too.
0:02:13 > 0:02:15Perhaps food stocks are low, temperatures are unusually high
0:02:15 > 0:02:20or low, or the water they are in has become polluted.
0:02:20 > 0:02:22Even whales make mistakes.
0:02:22 > 0:02:25It is thought they can sometimes lose their way into
0:02:25 > 0:02:28shallow waters by accident while travelling to warmer waters to mate.
0:02:28 > 0:02:30Whales are very sociable creatures and often travel
0:02:30 > 0:02:31in large pods or groups.
0:02:31 > 0:02:35Marines think if any whale is affected by any of the last four
0:02:35 > 0:02:41reasons, any travelling with it will copy them.
0:02:41 > 0:02:43That's all from me, for now, Newsround's back
0:02:43 > 0:02:45right here at 11.55.
0:02:45 > 0:02:51Bye!
0:02:51 > 0:02:58-- 12:15.
0:02:58 > 0:02:58Have
0:02:58 > 0:02:58Have a
0:02:58 > 0:02:58Have a great
0:02:58 > 0:03:02Have a great Saturday!