"Migration is the regular seasonal journey undertaken by many species. Movements include those made in response to changes in ________. These are usually essential or take one in only a good direction, and are termed variously as drifting, reinventing, waking or living. Migration is marked by its intuitive seasonality. In contrast, those that are non-migratory are said to be resident or sedentary. Here is, but one of many, long-distance migrants."
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