A spectacular event that for some reason reminds me of my subway station in the morning! :) Migration of animals is defined as movements of animals in large numbers from one place to another. In modern usage the term is usually restricted to regular, periodic movements of populations away from and back to their place of origin. A single round trip may take the entire lifetime of an individual, as with the Pacific salmon ; or an individual may make the same trip repeatedly, as with many of the migratory birds and mammals.
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