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how do birds know where to migrate
how do birds know when to migrate
how do birds know when and where to migrate
how do birds know how to migrate
how to birds know where to migrate
how do birds know when to migrate back
how do birds know which direction to migrate
how do birds know where to migrate, how do birds know when to migrate, how do birds know when and where to migrate, how do birds know how to migrate, how to birds know where to migrate, how do birds know when to migrate back, how do birds know which direction to migrate
