Noun
web-footed diving seabirds of northern seas: auks; puffins; guillemots; murres; etc.
Source: WordNetThe Holarctic has four endemic families: divers (Gaviidae), grouse (Tetraoninae), auks (Alcidae), and the waxwings (Bombycillidae). Source: Internet
Sergio L. Pereira, Allan J. Baker (2008) "DNA evidence for a Paleocene origin of the Alcidae (Aves: Charadriiformes) in the Pacific and multiple dispersals across northern oceans". Source: Internet
Two very fragmentary fossils are often assigned to the Alcidae, although this may not be correct: Hydrotherikornis (late Eocene ) and Petralca (Late Oligocene ). Source: Internet