These are terrestrial species, variable in size but generally plump with broad relatively short wings.
These birds are of variable size with slender bodies, long tails, and strong legs. Family: Caprimulgidae Nightjars are medium-sized nocturnal birds that usually nest on the ground.
They have long wings, short legs, and very short bills.
Two more species were introduced but are now extirpated and an additional 11 species and a species pair are hypothetical as defined below.
This list is presented in the taxonomic sequence of the Check-list of North American Birds, 7th edition through the 58th Supplement, published by the American Ornithological Society (AOS).
Different lengths of legs and bills enable multiple species to feed in the same habitat, particularly on the coast, without direct competition for food. Family: Stercorariidae They are in general medium to large birds, typically with gray or brown plumage, often with white markings on the wings.
They have longish bills with hooked tips and webbed feet with sharp claws. Family: Alcidae Alcids are superficially similar to penguins due to their black-and-white colors, their upright posture, and some of their habits.
The following tags are used to designate some species: Family: Anatidae The family Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans.
These birds are adapted to an aquatic existence with webbed feet, bills which are flattened to a greater or lesser extent, and feathers that are excellent at shedding water due to special oils. Family: Odontophoridae The New World quails are small, plump terrestrial birds only distantly related to the quails of the Old World, but named for their similar appearance and habits. Family: Phasianidae Phasianidae consists of the pheasants and their allies.
They are typically gray or white, often with black markings on the head or wings. Their long wings have black markings, as does the head. Family: Gaviidae Loons are aquatic birds, the size of a large duck, to which they are unrelated.
Their plumage is largely gray or black, and they have spear-shaped bills. Family: Ciconiidae Storks are large, heavy, long-legged, long-necked wading birds with long stout bills and wide wingspans. Family: Fregatidae Frigatebirds are large seabirds usually found over tropical oceans. Family: Pelecanidae Pelicans are very large water birds with a distinctive pouch under their beak.
The stilts have extremely long legs and long, thin, straight bills. Family: Charadriidae The family Charadriidae includes the plovers, dotterels, and lapwings.