WHY do birds migrate?

For a long time, there was only one explanation for birds’ migrations: they are cold in winter and need a change of climate. Yet feathers can do a pretty good job of protecting birds from the cold. For example, a canary capable of surviving the cold up to -45 degrees Celsius if it has enough food.

Now it is believed that birds fly away to warmer areas in winter from the winter lack of food. Birds use up the energy they get from food very quickly, which means they need to eat often and a lot.

So when the ground freezes and food is hard to find, especially for insectivorous birds, many of them head south.

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