Polish SwanA phase of the Mute Swan Cygnus olor in which the young birds are white instead of the usual grey, with pinkish or greyish feet instead of black. It is an example not of albinism (as pigment is present in the eyes) but of 'leucism'. Polish Swans are rare in the British Isles.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver