Family: Laridae (Gulls, Terns, Skimmers)
Authority: Raffles, 1822.
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). **source (http://datazone.birdlife.org/species/factsheet/22694612). Usually arrived to the Island of Labuan during the early month of May every year and seen mating and breeding along the islet of Pulau Ular, Layang-Layangan Labuan.