Scientific Name: Onychoprion aleuticus
Malay Name: Camar-Batu Kelabu
Chinese Name: 白腰燕鸥
Found from Siberia to Alaska, wintering to Southern China, Hong Kong, the Philippines, Malay Peninsula, Singapore and Indonesia.
Size: 32-34 cm
Identification: A medium-size tern with greyish upperparts, white rump and long deeply, forked tail, discontinuous dark band on under trailing edge and all black pointed bill. When in breeding plumage, white forehead contrasts with black eyestripe, hindcrown and nape. Crown of non-breeding bird mostly white with blackish ear-coverts and nape. Juvenile resembles non-breeding adult but has dark brown subterminal markings on upperparts.
Similar looking species: Common Tern
Habitat: Open seas.
Behaviour/Ecology: Feeds by plunge-diving. Often perches on floating objects and debris.
Local Status: Uncommon migrant
Conservation Status: Least Concern (IUCN 3.1)
Location: Singapore Strait
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