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When a bird migrates it is moving to a warmer spot in the world. How does it help them survive? well the temperature decreases in the winter dropping below zero, therefore not making the cold places a suitable place for the birds to live in. When they migrate they fly to some where closer to the equator where it is the hottest like Mexico. If exposed to the winters coldness for to long, the birds temperature will drop not giving the birds the right amount of body heat needed to survive. how those birds know when to migrate i assume the sudden drop in temperature gives them a hint that if they don't get a move on they're going to freeze.

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15y ago

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