Bridled GuillemotA form of the Guillemot Uria aalge with a white eye ring and a thin white line extending behind the eye. It is not regarded as a subspecies, but merely as an example of dimorphism. Bridled Guillemots may also be called 'Ringed Guillemots'. Their proportion in British colonies increases northwards.
Search Bird Dictionary
From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver