Auk

An auk is a seabird in the family Alcidae, adapted for swimming underwater with its wings. The family includes puffins, guillemots, murres, and razorbills.

Alcidae: A family of seabirds that includes auks such as puffins, guillemots, murres, and razorbills. Auk is a common name for members of this seabird family.
Wing-propelled diving: Underwater propulsion produced by flapping wings rather than paddling with the feet. Auks use their wings to fly through water in pursuit of prey.
Great auk: An extinct, flightless North Atlantic auk that was heavily hunted and last confirmed alive in 1852. The great auk is the best-known example of an auk driven to extinction by people.
Seabird colony: A dense breeding aggregation of seabirds at a shared nesting site. Many auks breed in large colonies on islands and coastal cliffs.
Puffin: Auks in the genus Fratercula, recognized by colorful bills and burrowing or crevice-nesting habits. Puffins are among the most familiar members of Alcidae.
Pursuit diving: A feeding strategy in which an animal chases prey underwater using active swimming. Auks catch fish and other prey by pursuing them below the surface.
Atlantic puffin: A North Atlantic auk with a colorful breeding-season bill and a diet dominated by small fish. This species illustrates the recognizable puffin form within the auk family.
Marine food web: A network of feeding relationships among organisms in a marine ecosystem. Auks link small fish and plankton to larger marine predators through feeding.
Guillemot: A common name for several auk species, including birds in the genera Uria and Cepphus. Guillemots are another major group included within the auk family.
Auk flight: Powered flight in auks, enabled by short wings that also provide underwater propulsion. The same compact wings that work underwater impose a high cost during aerial flight.

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