Bridled Guillemot
A 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.From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver