The Swallow Tailed Gull (Creagrus furcatus), endemic to the Galapagos Islands, is unique within the gulls and seabirds for feeding exclusively at night – it preys on squid and small fish. When it is not breeding it is totally pelagic, migrating eastward to the coasts of Ecuador and Peru. Swallow Tailed Gulls nest in small colonies throughout the year on the eastern side of the archipelago. They lay only one egg on the cliffs of all the Galapagos islands except Fernandina and Isabela. Its scientific name is originally derived from the Greek word for gull, "Glaros" and via Latin Larus, "gull" and furca "two-tined fork".
