Scientific Name: Onychoprion anaethetus
Malay Name: Camar-Batu Biasa
Chinese Name: 褐翅燕鸥
Found along the coasts and offshore islands of Africa to Indian Ocean, Arabian Peninsula, southern China, Southeast Asia, Australia, Central and South America
Polytypic. Subspecies are: melanopterus, antarcticus, anaethetus, nelsoni
Local Subspecies: anaethetus
Size: 37-42 cm
Identification: Non-breeding adult has dark brownish-grey upper side, thin whitish nuchal band, whitish forehead-patch, blackish crown, nape and mask, deeply forked tail and blackish bill, legs and feet. Breeding adult has clean white forehead and short eyebrow contrast with black eyestripe, crown and nape. Juvenile resembles non-breeding adult but has whitish tips and dark subterminal bars on upperparts and wing-coverts.
Habitat: Open seas.
Behaviour/Ecology: Seldom dives, preferring to pick up food material from the water surface. Feeds in the open seas, rarely coming to coastal waters.
Local Status: Uncommon resident
Conservation Status: Least Concern (IUCN 3.1)
Location: Straits of Singapore.
Craig Robson (2011) A Field Guide to the Birds of South-East Asia
Allen Jeyarajasingam & Alan Pearson (2012) A Field Guide to the Birds of Peninsular Malaysia and Singapore