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Great Crested Tern

From Opus

Alternative name: Swift Tern, Greater Crested Tern, Crested Tern, Great Crested-Tern

Adult breeding plumage, subspecies T. b. cristatusPhoto © by Karim Madoya Lokawi, Sabah, Malaysia, 15 March 2007
Adult breeding plumage, subspecies T. b. cristatus
Photo © by Karim Madoya
Lokawi, Sabah, Malaysia, 15 March 2007
Thalasseus bergii

Sterna bergii

Contents

[edit] Identification

Length 43–53 cm (17-20¾ in)

Juvenile, subspecies T. b. cristatusPhoto © by Joseph MorlanEast Point, Darwin, NT, Australia, 30 July 2014
Juvenile, subspecies T. b. cristatus
Photo © by Joseph Morlan
East Point, Darwin, NT, Australia, 30 July 2014

[edit] Adult

  • A large tern with a white forehead black cap that crests behind the head
  • Bright white underparts, and gray back and wings.
  • The bill is long, yellow, and slightly down-curved.
  • Wings are long, extending beyond the tail when not in flight.
  • Legs black.
  • Sexes alike.

[edit] Non-breeding

Reduced black cap; crest reduced.

[edit] Juvenile

Barred with dark blackish brown. Has a dusky yellow-olive bill and smudgy head.

[edit] Similar Species

Caspian Tern is much larger with bright red bill. Lesser Crested Tern is smaller, paler above and has an orange, not yellow bill. Royal Tern is much paler above and has a rich orange bill. In breeding plumage, Great Crested Tern has a white forehead, while Royal Tern has the forehead black connecting to the black cap.

Nominate subspeciesPhoto © by max1Boulders Beach, Cape Town, South Africa, 25 November 2016
Nominate subspecies
Photo © by max1
Boulders Beach, Cape Town, South Africa, 25 November 2016

[edit] Distribution

Coasts of Africa, southern Asia and Australasia:
Northern Africa: occurs only in Egypt
Eastern Africa: Sudan, Eritrea, Djibouti, Somalia, Kenya, Tanzania, Zanzibar, Mozambique, Namibia
South Africa: KwaZulu-Natal
African Islands: Madagascar, Comoros, Seychelles
Middle East: Israel, Arabian Peninsula, Saudi Arabia, Yemen, Socotra, Oman, United Arab Emirates, Qatar, Bahrain, Kuwait, Iraq, Iran
Asia: China, Pakistan, India, Andaman and Nicobar Islands, Maldives, Sri Lanka, Bangladesh, Japan, Taiwan
Southeast Asia: Indochina, Myanmar, Laos, Vietnam, Cambodia, Thailand, Malaysia, Borneo, Malay Peninsula, Brunei, Singapore, Philippines, Indonesia, Greater Sundas, Sumatra, Java, Sulawesi, Lesser Sundas, Bali, West Timor, East Timor
Australasia: New Guinea, Papua New Guinea, Australia: New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Victoria, Western Australia, Polynesia, Melanesia, Samoa, Micronesia, Fiji, Solomon Islands, Vanuatu, Tonga, New Caledonia, Micronesia

[edit] Taxonomy

Photo © by Ken DoyWellington Point, Queensland, Australia, 14 February 2014
Photo © by Ken Doy
Wellington Point, Queensland, Australia, 14 February 2014

Like its relatives, this species was formerly placed in the genus Sterna.

[edit] Subspecies

This is a polytypic species with four subspecies currently recognized:[1]

  • T. b. bergii
  • T. b. thalassinus
  • T. b. velox
  • T. b. cristatus
  • Ryukyu Islands and southeastern China to the Philippines, the Sunda Islands, Wallacea, New Guinea, Australia, and the tropical Pacific Ocean (to southeastern Polynesia) - Like bergii, with tail, rump and back concolorous.
Photo © by Dave IrvingKeelung, Taiwan, August 2013
Photo © by Dave Irving
Keelung, Taiwan, August 2013

Races T. b. enigma of Islands off Mozambique, Zambezi River delta and Madagascar and T. b. gwendolenae of Western and north-western Australia no longer considered valid. Synonymized with nominate bergii and cristatus respectively.

[edit] Habitat

Tropical and subtropical coasts and oceanic islands. Restricted to continental shelf, venturing to about 3 km inland. More marine than Royal Tern.

[edit] Behaviour

[edit] Action

Forages by plunging from several meters above the surface to take fish. Noisy, often in flocks. A common species in its range.

Photo © by Ken DoyWellington Point, Brisbane, Queensland, 2 Sept 2016
Photo © by Ken Doy
Wellington Point, Brisbane, Queensland, 2 Sept 2016

[edit] Diet

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

[edit] Breeding

Monogamous but highly colonial. Nest is a depression in sand, usually unlined. Clutch size usually single egg, highly variable in color. Nesting season varies with latitude and location.

[edit] Vocalisation

Highly vocal, especially at nesting colonies. The territorial advertising call is a loud, raucous kirrak or kirrik. Juvenile gives thin, vibrating whistle.

[edit] Movements

Movement patterns mostly unknown. Many populations are more or less resident around breeding colonies.

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Gill, F & D Donsker (Eds). 2018. IOC World Bird List (v8.2). doi : 10.14344/IOC.ML.8.2. Available at http://www.worldbirdnames.org/
  1. Avibase
  2. Gochfeld, M., Burger, J., Kirwan, G.M., Christie, D.A. & Garcia, E.F.J. (2018). 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 https://www.hbw.com/node/54019 on 9 July 2018).
  3. Higgins, P. J.; Davies, S. J. J. F., eds. (1996). Handbook of Australian, New Zealand and Antarctic Birds: Volume 3: Snipe to Pigeons. Melbourne: Oxford University Press. ISBN 0-19-553070-5.
  4. Sinclair, I., Hockey, P.A.R., and Arlott, N. (2005). The Larger Illustrated Guide to Birds of Southern Africa. Struik, Cape Town. ISBN 978-1775840992
  5. Wikipedia contributors. (2018, June 17). Greater crested tern. In Wikipedia, The Free Encyclopedia. Retrieved 18:13, July 9, 2018, from https://en.wikipedia.org/w/index.php?title=Greater_crested_tern&oldid=846261713

[edit] External Links


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