Question

Animals migrate; we know why but how does it work?

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Answer 1

Answer:

Animals use a variety of cues to determine when it is time to migrate. Some migrations are triggered by external cues, like changing daylight hours or temperature. ... Some animals rely on the position of the sun, moon, or stars, some use smell, and still others use the magnetic field of the Earth to guide them.

Answer 2

Answer:

Migration of animals work like a periodic work of an year