Auks are birds in the alcid family. They range in size from the 3 ounce least auklet to the 2.2 pound thick-billed murre. While they are good swimmers and divers, when they walk on land they look clumsy.
Auks look somewhat like penguins with their black-and-white coloration, their upright posture, and some of their habits. Auks fill a similar ecological niche in the northern hemisphere as penguins do in the southern hemisphere. But auks (except for the extinct great auk) can fly. Auks and penguins are examples of convergent evolution.
Auks live on the open seas of the cool subarctic ocean. They only go ashore for breeding, and the Pribilof Islands are one of the best places to find them.