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
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 (BirdLife International 2019)
Location: Straits of Singapore.
BirdLife International. (2019). Onychoprion anaethetus. The IUCN Red List of Threatened Species 2019. Downloaded on 2 September 2021
Jeyarajasingam, A., & Pearson, A. (2012). A Field Guide to the Birds of Peninsular Malaysia and Singapore. Oxford University Press.
Robson, C. (2008). A Field Guide to the Birds of South-East Asia. New Holland Publishers.