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date=August 2014 thumb|200px|right|Common guillemots, one in bridled form (with "spectacles"), and one Brünnich's guillemot (U. lomvia, with white-marked bills) from the genus Uria. thumb|150px|right|Black guillemot (C. grylle) from the genus Cepphus. thumb|150px|right|Common guillemot in bridled form, a white circle around the eye with an extension backwards suggesting they are wearing spectacles. Guillemot is the common name for several species of seabird in the Alcidae or auk family (part of the order Charadriiformes). In British use, the term comprises two genera: Uria and Cepphus. In North America the Uria species are called "murres" and only the Cepphus species are called "guillemots". This word of French origin derives from a form of the name William, cf. The two living species of Uria, together with the razorbill, dovekie, and the extinct great auk, make up the tribe Alcini. They have distinctly white bellies, thicker and longer bills than Cepphus, and form very dense colonies on cliffs during the reproductive season. Guillemot eggs are large (around 11% of female weight), pointed at one end, and water-repellent and self-cleaning. The three living species of Cepphus form a tribe of their own: Cepphini. They are smaller than the Uria species and have black bellies, rounder heads and bright red feet.