The Arctic loon (Gavia arctica) is an elegant and distinctive diving bird, with a dark grey or black, dagger-shaped bill and deep red eyes. In the breeding adult, a conspicuous black and white striped pattern extends from the shoulders onto the lower neck. The upperparts of the Arctic loon are black and the underparts are white, although this white coloration is mostly hidden while swimming, except for two patches to the rear of the body. The back of the neck, head, throat and chin are matt grey. The front of the neck is black and sometimes has a green iridescence when the individual is in breeding plumage.