0:00:03 > 0:00:06Hi, guys, Ricky here, with news of a dramatic rescue on the way.
0:00:06 > 0:00:13Plus, why rats are more like us than we thought.
0:00:13 > 0:00:17First to a major rescue attempt to save a climber trapped in Germany's
0:00:17 > 0:00:18deepest cave:
0:00:18 > 0:00:21hundreds of people are trying to reach the man, who's
0:00:21 > 0:00:22a thousand metres below ground.
0:00:22 > 0:00:26He was injured after rocks fell on him while he was walking
0:00:26 > 0:00:27in mountains with friends.
0:00:27 > 0:00:29Another man managed to climb out to get help,
0:00:29 > 0:00:32but that took him 12 hours.
0:00:32 > 0:00:34They're currently trying to get a doctor
0:00:34 > 0:00:36into the cave to treat the man.
0:00:36 > 0:00:40Next to a scientific breakthrough that could show that rats are more
0:00:40 > 0:00:42like us than we might have thought:
0:00:42 > 0:00:44a new study claims they experience regret,
0:00:44 > 0:00:50something that was always thought to be uniquely human - until now.
0:00:50 > 0:00:51Hmmm, what to have?
0:00:51 > 0:00:53The salad or the burger?
0:00:53 > 0:00:56The burger looks good, but I don't have much time.
0:00:56 > 0:00:58I've got to get back to work.
0:00:58 > 0:00:59You know what?
0:00:59 > 0:01:00I'll go for the salad.
0:01:00 > 0:01:03The feeling when you regret something - it's when you make
0:01:03 > 0:01:07a decision and then afterwards realise you've made a bad choice.
0:01:07 > 0:01:10Up until recently, scientists believed only humans were
0:01:10 > 0:01:12able to experience regret.
0:01:12 > 0:01:17But then researchers in Minnesota in America ran this test.
0:01:17 > 0:01:20Scientists used treats to entice rats into a food station,
0:01:20 > 0:01:23where they could either wait for their favourite meal or go to
0:01:23 > 0:01:27the next stop, where another treat was ready immediately.
0:01:27 > 0:01:30The rats who just couldn't wait showed they regretted their decision
0:01:30 > 0:01:34by turning around and looking back at what they could have had.
0:01:34 > 0:01:38They called this a regret-inducing situation.
0:01:38 > 0:01:41Regret is an incredibly useful emotion to be able to learn to do
0:01:41 > 0:01:44the right things in the future.
0:01:44 > 0:01:47What's exciting for us as scientists in this case is that by being able
0:01:47 > 0:01:51to look at these emotions in rats, it means that we can also look into
0:01:51 > 0:01:54the brain in a very fine scale.
0:01:54 > 0:01:57The study also showed that rats, like humans,
0:01:57 > 0:01:59have different tastes in food.
0:01:59 > 0:02:01For example, one rat would happily wait 20 seconds
0:02:01 > 0:02:06for a cherry treat but wouldn't wait that long for a chocolate treat.
0:02:06 > 0:02:09Scientists hope this will help us learn more about our own decision
0:02:09 > 0:02:12making and how our brains react.
0:02:12 > 0:02:13Hm, do you know what?
0:02:13 > 0:02:15I should have gone for the burger.
0:02:15 > 0:02:18But actually, hang on, is that lasagne?
0:02:18 > 0:02:21Prince William has joined forces with David Beckham to try to stop
0:02:21 > 0:02:23illegal wildlife poaching around the world.
0:02:23 > 0:02:27Wills has launched a new campaign today to try and stop critically
0:02:27 > 0:02:31endangered animals like rhino, elephants and tigers being hunted.
0:02:31 > 0:02:34Becks, who worked with the Duke on England's 2018 World Cup bid,
0:02:34 > 0:02:37has backed the plan.
0:02:37 > 0:02:40Finally, if you've ever wondered what a polar bear gets up to
0:02:40 > 0:02:41every day, then watch this.
0:02:41 > 0:02:44These pics were taken from a special camera attached to
0:02:44 > 0:02:46this bear's collar in Alaska, USA.
0:02:46 > 0:02:48They show the bear swimming and chatting up potential mates.
0:02:48 > 0:02:51Researchers hope it will help them understand how polar bears
0:02:51 > 0:02:55cope with changing conditions.
0:02:55 > 0:02:57Newsround is back tomorrow morning with Jenny.