Puffins are any of three small species of auk

Auk

An auk is a bird of the family Alcidae in the order Charadriiformes. Auks are superficially similar to penguins due to their black-and-white colours, their upright posture and some of their habits...

 (or alcids) in the bird

Bird

Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

 genus Fratercula with a brightly coloured beak during the breeding season. These are pelagic

Pelagic zone

Any water in a sea or lake that is not close to the bottom or near to the shore can be said to be in the pelagic zone. The word pelagic comes from the Greek πέλαγος or pélagos, which means "open sea". The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes...

 seabird

Seabird

Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...

s that feed primarily by diving in the water. They breed in large colonies

Bird colony

A bird colony is a large congregation of individuals of one or more species of bird that nest or roost in close proximity at a particular location. Many kinds of birds are known to congregate in groups of varying size; a congregation of nesting birds is called a breeding colony...

 on coastal cliffs or offshore islands, nesting in crevices among rocks or in burrows in the soil. Two species, the Tufted Puffin

Tufted Puffin

The Tufted Puffin also known as Crested Puffin, is a relatively abundant medium-sized pelagic seabird in the auk family found throughout the North Pacific Ocean....

 and Horned Puffin

Horned Puffin

The Horned Puffin is an auk, similar in appearance to the Atlantic Puffin; this bird's bill is yellow at the base and red at the tip. It is a pelagic seabird that feeds primarily by diving for fish. It nests in colonies, often with other auks.The yellow bill plate grows before the breeding...

, are found in the North Pacific Ocean, while the Atlantic Puffin

Atlantic Puffin

The Atlantic Puffin is a seabird species in the auk family. It is a pelagic bird that feeds primarily by diving for fish, but also eats other sea creatures, such as squid and crustaceans. Its most obvious characteristic during the breeding season is its brightly coloured bill...

 is found in the North Atlantic Ocean.

All puffin species have predominantly black or black and white plumage, a stocky build, and large beak

Beak

The beak, bill or rostrum is an external anatomical structure of birds which is used for eating and for grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young...

s.