AbmigrationMovement of an individual from one breeding area to another by pairing in a winter flock with a bird from the new area and travelling there with it on spring migration. Examples of abmigrants are found in bird groups whose winter flocks contain birds from various breeding grounds mixed together, notably ducks (family Anatidae).
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver