ExtralimitalOccurring only outside the boundaries of the area under consideration. For example, the Kittiwake Rissa tridactyla has a relative, the Red-legged Kittiwake R. brevirostris, which breeds only in the north Pacific and, so far as Europe is concerned, would be described as extralimital.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver