Not just birds
It's not only birds that migrate. Animals of all shapes and sizes - from butterflies and eels to turtles and reindeer - are also on the move every year. Some, such as toads, may travel just a few hundred metres. Others, such as whales, may travel thousands of kilometres. All of them are moving for the same reason – to survive. It took thousands of years for people to unlock the mysteries of migration. And there is still plenty that we don’t fully understand. How do birds know where they’re going? How do they find their way? How do they survive the journey? Why do they come back? The answers to these questions reveal some of the most amazing secrets of the animal world. |
