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scientists believe birds detect changes in the temperature and daylight as days get shorter and the amount of light decreases, birds produce certain hormones that seem to trigger the drive to migrate

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15y ago

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How do birds know when to migrate?

they know when to migrate because of the weather and the food decreasing


How do birds know where to migrate?

because of their instincts.


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Why do birds migrate and what would happen if they didn't?

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