Unbridled guillemot, and bridled …

Unbridled guillemot, and bridled …

Sticking with auks …

“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.”

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