CagebirdAn individual or a species kept in captivity. Some species which occur wild in the British Isles are popular as cagebirds, notably some of the finches (family Fringillidae), but close ringing is accepted as proof that they were breed in captivity and that their keeper has not broken the protection laws. Problems can be caused when a bird seen in the wild could be a naturally occurring vagrant, but could also be an escape from captivity. The keeping of cagebirds is called aviculture.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver