Guillemots, belonging to the genus Uria, are seabirds known for their striking black and white plumage and impressive diving abilities. The two primary species of guillemots are the Common Guillemot (Uria aalge) and the Brünnich's Guillemot (Uria lomvia).

Guillemots have black upperparts and white underparts, with a black head and neck during the breeding season. Their sharp, pointed bills are well-adapted for catching fish. In winter, their face becomes whiter.

They are medium-sized seabirds, about 38-46 cm long, with a 61-73 cm wingspan.

Guillemots are adept divers, using their wings to "fly" underwater. They primarily feed on small fish such as capelin, sand eels, and sprats but consume crustaceans and marine invertebrates.

Guillemots are found in the North Atlantic and North Pacific Oceans. They breed along the coasts of northern Europe, North America, and parts of Asia. During the non-breeding season, they migrate south to more temperate waters.