The roseate tern (Sterna dougallii) is a tern in the family Laridae. “Roseate” refers to the bird’s pink breast in breeding plumage. This species has a number of geographical races, differing mainly in bill colour and minor plumage details. As with other Sterna terns, roseate tern feeds by plunge-diving for fish, almost invariably from the sea; it is much more marine than allied terns, only rarely visiting freshwater lagoons on the coast to bathe and not fishing in fresh water. It usually dives directly, and not from the “stepped-hover” favoured by Arctic tern. The offering of fish by the male to the female is part of the courtship display. Every year from May till August , this aves spotted breeding at the islet of Batuan Pulau Ular off coast of the westcoast of Labuan Island. This species is totally protected under Schedule 2, Act 716, Akta Pemuliharaan Hidupan Liar 2010.