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Migration means to regularly move from one area to another in each season or to move from one area and settle in another.
It is commonly showed by some birds which travel from country to country if the weather does not suit them.
Migration is long-distance movement of found in all major animal groups, including birds, mammals, fishes etc..birds migrating south for the winter; wildebeest migrating annually for seasonal grazing; or a major habitat change as part of their life, such as young Atlantic salmon leaving the river of their birth when they have reached a few inches in size.