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The Black Guillemot (Cepphus grylle) is a bird in the Alcidae family of Auks. It was also known as the synonym Uria grylle.

Black Guillemot

The Black Guillemot (Cepphus grylle) is a bird in the Alcidae family of Auks. It was also known as the…

"Uria grylle. Black Guillemots. Bill much shorter than head, about equal to tarsus, straight, rather stout, moderately compressed; culmen at first straight, then decurved; gape straight to near tip; gonys short straight, ascending, about 1/2 as long as culmen. No nick or groove near tip of upper mandible; its tomial edge scarcely inflected. Nasal fossae large and deep, partially filled with feathers which do not entirely cover the nostrils." Elliot Coues, 1884

Black Guillemot Bill

"Uria grylle. Black Guillemots. Bill much shorter than head, about equal to tarsus, straight, rather…