Family Gulls, Terns, Skimmers (Laridae)

Least Concern

Greater Crested Tern (Thalasseus bergii)


Taxonomy

French: Sterne huppée German: Eilseeschwalbe Spanish: Charrán piquigualdo
Other common names: Swift Tern
Taxonomy:

Sterna Bergii

M. H. C. Lichtenstein

, 1823,

Cape of Good Hope, South Africa

.

Has been thought to be closely related to T. maximus. Possibly hybridizes with T. bernsteini. Subspecific taxonomy unusually confusing; race enigma perhaps better synonymized with nominate, and gwendolenae with cristatus; many other races proposed, e.g. bakeri (Makran coast, in SE Iran and S Pakistan), edwardsi (Sri Lanka), halodramus (Sulu Is, in SW Philippines), pelecanoides (Torres Strait, NE Australia), poliocerca (Tasmania). In contrast, species sometimes treated as monotypic. Six subspecies currently recognized.

Subspecies and Distribution
  • T. b. velox (Cretzschmar, 1827) – Red Sea and NW Somalia E to Myanmar, Maldives and Sri Lanka; W populations winter S to Kenya.
  • T. b. thalassinus (Stresemann, 1914) – Tanzania, Seychelles, Aldabra and Rodrigues I, and possibly this race in NW Madagascar; wanders to S Somalia.
  • T. b. enigma (Clancey, 1979) – Zambezi Delta, believed to nest on islands off Mozambique and Madagascar.
  • T. b. bergii (M. H. C. Lichtenstein, 1823) – Namibia to South Africa; some non-breeders to S Mozambique.
  • T. b. cristatus (Stephens, 1826) – Malaysia to Philippines and Ryukyu Is; E Australia to Society and Tuamotu Is.
  • T. b. gwendolenae (Mathews, 1912) – W & NW Australia.
  • Descriptive notes

    43–53 cm; 320–400 g (velox 340–400 g, thalassinus 320–350 g, cristata 325–383 g); wingspan 100–130 cm. Large... read more

    Voice

    Highly vocal, especially at its nesting colonies. The territorial advertising call is a loud,... read more

    Habitat

    Tropical and subtropical coasts and oceanic islands. More marine than the Royal Tern T.... read more

    Food and feeding

    Feeds mainly on fish (10–15 cm long); also opportunistically on squid, crabs, insects, baby turtles and other aquatic prey. In a... read more

    Breeding

    Recorded during April–June in the Indian Ocean, May–June in Sudan and S Africa, August in Somalia, September–December in... read more

    Movements

    Movement patterns mostly unknown, and many populations are more or less resident around breeding... read more

    Status and conservation

    Not globally threatened (Least Concern). The global population is not known precisely but may exceed two million individuals. The species is nonetheless locally vulnerable... read more

    Recommended citation

    Gochfeld, M., Burger, J., Kirwan, G.M., Christie, D.A. & Garcia, E.F.J. (2017). Greater Crested Tern (Thalasseus bergii). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/54019 on 23 July 2017).