Frigate Bird (Fregata), a genus of tropical and sub-tropical web-footed birds. The strong, hooked bill is longer than the head; wings long and pointed: tail of twelve feathers deeply forked. F. aquila is generally distributed in tropical regions; length about 40 inches, dusky above, white below. The under surface is darker in adult males, and they have a distensible, orange-coloured gular sac. F. minor is confined to the Eastern seas, and is very numerous in Torres Straits. Both species are very strong on the wing.