The least auklet (Aethia pusilla) is a seabird and the smallest species of auk.

They breed on the islands of Alaska and Siberia, and spend the winter close to the edge of the ice sheet[clarification needed].

Like all auks they are pursuit divers, using their wings to provide thrust and "fly" under the water.

A single egg is laid in the crevice and incubated for a month, after which a semi-precocial black downy chick is hatched.

The chicks receive no further parental care after they fledge, and can dive to hunt as soon as they leave the nest.