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South Plazas Island, Galapagos, Ecuador; a male/female pair of Swallow-tailed Gulls (Creagrus furcatus) stay near one another during the breeding season, the Swallow-tailed Gull has no structural or plumage differences between the male and female. In the breeding season, the adult has a black plumaged head and a bright red fleshy rim around each eye. Outside the breeding season, the head is white and the eye rim becomes black. It has a grayish upper breast, gray mantle, and black wingtips. The mostly black bill has a contrasting white tip. It is the only fully nocturnal feeding gull or seabird in the world. , Copyright © Matthew Meier, matthewmeierphoto.com All Rights Reserved