The Evolution of Whale Sharks

They have this really interesting habit, whale sharks, which is they dive down about 2,000 metres. They're the size of the world's largest you to cycle. One 18, one 12, two were eight. And we don't know why they do it because down there there's less oxygen, there's less food, it's very cold. So they have to warm themselves up a bit afterwards. It might be so they can get a better reading of the Earth's magnetic field closer to the crust. Which is effectively that they're going to get a better signal.