Cormorant (q.v.) and gannet as well as the true pelicans, and for a long while these and some other distinct groups, as the snake-birds (q.v.), frigate-birds (q.v.) and tropic-birds (q.v.), which have all the four toes of the foot connected by a web, were regarded as forming a single family, Pelecanidae; but this name has now been restricted to the pelicans only, though all are still usually associated in the suborder Steganopodes of Ciconiiform birds.
The sea-birds include a great variety of gulls, guillemots, cormorants, albatrosses (four species), fulmars and petrels, and in the Gulf of St Lawrence the gannet is very abundant.