Greater Crested Tern

Scientific Name: Thalasseus bergii
Malay Name: Camar Berjambul Besar
Chinese Name: 大凤头燕鸥
Alternative Name(s): Swift Tern, Great Crested Tern, Yellow-billed Tern

Range:
Found along the coasts of Africa to Arabian Peninsula, Indian Ocean, southern China, southern Japan, Southeast Asia and Australasia.

Taxonomy:
Polytypic. Subspecies are: bergii, thalassinus, velox, cristatus.

Size: 45-49 cm

Identification:
Non-breeding adult has distinctive long, thick cold yellow bill, darkish grey upperparts, white face and forecrown, blackish hindcrown with whitish streaks and blackish nape. Breeding adult has bright yellow bill, black crown to nape with shaggy crest and white extreme forehead. Juvenile resembles non-breeding adult but has duller bill and brownish feathers with whitish fringes on mantle and back.

Similar looking species: Lesser Crested Tern

Habitat: Open seas, sea-coasts, mudflats and sandflats.

Behaviour/Ecology: Feeds mostly at sea by plunge diving or by dipping from the surface. Food is usually swallowed in mid-air.

Local Status: Uncommon migrant

Conservation Status: Least Concern (BirdLife International 2018)

Location: Straits of Johor, Straits of Singapore, Changi and Pulau Ubin.

Photos:

External Links:
Conservation Status: IUCN Red List Page
Photos: Oriental Bird Images
Sound Recordings: xeno-canto Link
Wikipedia Entry: Wikipedia Link

References:
BirdLife International. (2018). Thalasseus bergii. The IUCN Red List of Threatened Species 2018. Downloaded on 2 September 2021
Robson, C. (2008). A Field Guide to the Birds of South-East Asia. New Holland Publishers.