1) Bird family 2) Family alcidae 
bird family, order Charadriiformes, which includes the birds known as auk, auklet, dovekie, guillemot, murre, murrelet, and puffin (qq.v.).[2 related articles]
Alcidae is the auks family of birds of the order Natatores. They are characterized by a bill which is much flattened vertically; short wings; legs placed at the extremity of the body; the feet are three-toed and palmated; the tail is short. They feed mostly on fish captured by diving.
[n] - web-footed diving seabirds of northern seas: auks
family Alcidae noun web-footed diving seabirds of northern seas: auks; puffins; guillemots; murres; etc.