Loop migrationA type of movement which is similar to normal migration except that the return journey from the winter quarters to the breeding grounds follows a different route from that of the outward journey. For example, the White-fronted Goose Anser albifrons returns from its winter quarters in the British Isles to its breeding grounds in Arctic Russia by a route which lies considerably to the south of that followed in autumn.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver