Question

how is migration known?​

Answer 1

Migration, in ethology, the regular, usually seasonal, movement of all or part of an animal population to and from a given area. ... The daily movements of certain fishes and invertebrates have also been called migrations because of their regular occurrence.

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Answer 2

Migration, in ethology, the regular, usually seasonal, movement of all or part of an animal population to and from a given area. ... The daily movements of certain fishes and invertebrates have also been called migrations because of their regular occurrence.