Question

why do birds and animals migrate

Answer 1

Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations. As winter approaches and the availability of insects and other food drops, the birds move south again.

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Answer 2

Hello friend,
They migrate in order to escape from severe climatic conditions and also to reproduce and to get food in large quantity.
hope it helps.