- any of several web-footed seabirds of the family Phaethontidae, chiefly of tropical seas, having white plumage with black markings and a pair of greatly elongated central tail feathers.
- any aquatic bird of the tropical family Phaethontidae, having long slender tail feathers and a white plumage with black markings: order Pelecaniformes (pelicans, cormorants, etc)
