Totipalmate, with four toes united by web. Oil-gland tufted. Fifth secondary wanting. After-shaft rudimentary or wanting. Desmognathous, distinctly con¬nected with the Accipitres, Young hatched blind and helpless.
Mid-tail greatly produced. PHAETON . TROPIC BIRDS.
Tail rounded or cuneate .
PELECANUS . PELICANS.
PHALACROCORAX . CORMORANTS.
SULA . BOOBIES.
Tail forked . FREGATA FRIGATE BIRDS.
TROPIC BIRDS, PELICANS, CORMORANTS and DARTERS. GANNETS or BOOBIES, and FRIGATE BIRDS.
Totipalmate, with four toes united by a web. Hind toe turned inwards. Tongue rudimentary. Oil-gland tufted. Fifth secondary wanting. After-shaft rudimentary or wanting. Plumage of neck continuous. Desmognathous, distinctly connected with the Accipitres. Young hatched blind, either naked or covered with down, undergoing a protracted downy stage, during which they are helpless and fed by parents. Food chiefly fishes, Crustacea, or insects.