AP BIOLOGY

Detailed explanation-1: -Most often birds move to breeding grounds in the spring and then to wintering grounds in the fall. Some species make an additional movement to a third location, such as a molt migration to a location for molting (i.e., replacing of the feathers).

Detailed explanation-2: -Finally, some animals migrate for reproductive reasons: either to find a mate, raise their young, or to spawn. For example, salmon start life in rivers and migrate to the sea to feed and grow. After spending up to seven years in the ocean, they migrate back to the rivers they were born in so that they can spawn.

Detailed explanation-3: -Animals and birds migrate from one place to another place in search of food, to avoid extreme weather conditions, or to breed. Birds mainly migrate for food and the formation of nests to grow their young ones for their proper feeding.

Detailed explanation-4: -Migratory behavior is persistent and straightened-out movement effected by the animal’s own locomotory exertions or by its active embarkation on a vehicle. It depends on some temporary inhibition of station-keeping responses, but promotes their eventual disinhibition and recurrence.