Gull-billed tern

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Gull-billed tern
Gelochelidon nilotica vanrossemi.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Laridae
Genus: Gelochelidon
Species:
G. nilotica
Binomial name
Gelochelidon nilotica
(Gmelin, JF, 1789)
Gelochelidon nilotica map.svg
  Year-round
  Breeding
  Nonbreeding
Synonyms

Sterna nilotica

The gull-billed tern (Gelochelidon nilotica), formerly Sterna nilotica, is a tern in the family Laridae. It is widely distributed and breeds in scattered localities in Europe, Asia, northwest Africa, and the Americas. The Australian gull-billed tern was previously considered a subspecies.

Contents

Taxonomy

The gull-billed tern was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae . He placed it with terns in the genus Sterna and coined the binomial name Sterna nilotica. [2] Gmelin based his description on the "Egyptian tern" that had been described in 1785 by the English ornithologist John Latham in his book A General Synopsis of Birds. [3] Latham had in turn based his own account on that by the Swedish naturalist Fredrik Hasselquist that was published in 1757. [4] The gull-billed tern was moved to the resurrected genus Gelochelidon based on a molecular phylogenetic study published in 2005. [5] [6] [7] The genus had been introduced in 1830 by the German zoologist Alfred Brehm. [8] The genus name combines the Ancient Greek gelaō meaning "to laugh" with khelidōn meaning "swallow". The specific epithet nilotica is from Latin niloticus meaning "of the River Nile". [9]

Five subspecies are recognised: [7]

ImageSubspeciesDistribution
Gull-billed Tern, Bahrain 4.jpg G. n. nilotica(Gmelin, 1789) nominate, found in Europe, North Africa through the Middle East & south-central Asia to western China & Thailand
Gelochelidon nilotica Mai Po 2.jpg G. n. affinis(Horsfield, 1821)found in Transbaikalia to Manchuria, Japan, south and east China through southeast Asia to the Philippines, Borneo, Sulawesi & Sumatra
Gelochelidon nilotica 1.jpg G. n. aranea(Wilson, 1814)found in eastern & southern United States, Greater Antilles
Gelochelidon nilotica vanrossemi.jpg G. n. vanrossemiBancroft, 1929found from southern California to northwestern Mexico
G. n. gronvoldi Mathews, 1912found from French Guiana to northeastern Argentina

Description

Eggs, Collection Museum Wiesbaden Gelochelidon nilotica MWNH 0396.JPG
Eggs, Collection Museum Wiesbaden

This is a fairly large and powerful tern, similar in size and general appearance to a Sandwich tern, but the short thick gull-like bill, broad wings, long legs and robust body are distinctive. The summer adult has grey upperparts, white underparts, a black cap, strong black bill and black legs. The call is a characteristic ker-wik. It is 33–42 cm (13–17 in) in length and 76–91 cm (30–36 in) in wingspan. [10] [11] Body mass ranges from 150–292 g (5.3–10.3 oz). [12]

In winter, the cap is lost, and there is a dark patch through the eye like a Forster's tern or a Mediterranean gull. Juvenile gull-billed terns have a fainter mask, but otherwise look much like winter adults.

Juvenile Sandwich terns have a short bill, and are frequently mistaken for gull-billed tern where the latter species is uncommon, such as North Sea coasts.

Distribution and habitat

It breeds in warmer parts of the world in southern Europe, temperate and eastern Asia, both coasts of North America, eastern South America. This bird has a number of geographical races, differing mainly in size and minor plumage details.

All forms show a post-breeding dispersal, but the northern breeders are most migratory, wintering south to Africa, the Caribbean and northern South America, southern Asia and New Zealand.

The gull-billed tern is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

Behaviour and ecology

Breeding

The gull-billed tern breeds in colonies on lakes, marshes and coasts (including bays and earthen levees). It nests in a ground scrape and lays two to five eggs. While widely distributed in freshwater areas in Eurasia, it is associated almost solely with saltwater, coastal areas in North America. [10]

Food and feeding

This is a somewhat atypical tern, in appearance like a Sterna tern, but with feeding habits more like the Chlidonias marsh terns, black tern and white-winged tern. It does not normally plunge dive for fish like the other white terns, and has a broader diet than most other terns. It largely feeds on insects taken in flight, and also often hunts over wet fields and even in brushy areas, to take amphibians and small mammals. [10] It is also an opportunistic feeder, and has been observed to pick up and feed on dead dragonflies from the road. [13]

Related Research Articles

<span class="mw-page-title-main">Tern</span> Family of seabirds

Terns are seabirds in the family Laridae, subfamily Sterninae, that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated in eleven genera in a subgroup of the family Laridae, which also includes several genera of gulls and the skimmers (Rynchops). They are slender, lightly built birds with long, forked tails, narrow wings, long bills, and relatively short legs. Most species are pale grey above and white below with a contrasting black cap to the head, but the marsh terns, the black-bellied tern, the Inca tern, and some noddies have dark body plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults. Terns have a non-breeding plumage, which usually involves a white forehead and much-reduced black cap.

<span class="mw-page-title-main">Laridae</span> Family of birds

Laridae is a family of seabirds in the order Charadriiformes that includes the gulls, terns, noddies, skimmers, and kittiwakes. It includes around 100 species arranged into 22 genera. They are an adaptable group of mostly aerial birds found worldwide.

<span class="mw-page-title-main">Laughing gull</span> Species of bird

The laughing gull is a medium-sized gull of North and South America. Named for its laugh-like call, it is an opportunistic omnivore and scavenger. It breeds in large colonies mostly along the Atlantic coast of North America, the Caribbean, and northern South America. The two subspecies are L. a. megalopterus — which can be seen from southeast Canada down to Central America — and L. a. atricilla, which appears from the West Indies to the Venezuelan islands. The laughing gull was long placed in the genus Larus until its present placement in Leucophaeus.

<span class="mw-page-title-main">Short-billed dowitcher</span> Species of bird

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<span class="mw-page-title-main">Sandwich tern</span> Species of bird

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<span class="mw-page-title-main">Ancient murrelet</span> Species of bird

The ancient murrelet is a bird in the auk family. The English term "murrelet" is a diminutive of "murre", a word of uncertain origins, but which may imitate the call of the common guillemot. Ancient murrelets are called "ancient" because they have grey on the back like a shawl, as worn by the elderly.

<span class="mw-page-title-main">Royal tern</span> Species of bird

The royal tern is a tern in the family Laridae. The species is endemic to the Americas, though vagrants have been identified in Europe.

<i>Sterna</i> Genus of birds

Sterna is a genus of terns in the bird family Laridae. The genus used to encompass most "white" terns indiscriminately, but mtDNA sequence comparisons have recently determined that this arrangement is paraphyletic. It is now restricted to the typical medium-sized white terns occurring near-globally in coastal regions.

<span class="mw-page-title-main">African jacana</span> Species of bird

The African jacana is a wader in the family Jacanidae. It has long toes and long claws that enables it to walk on floating vegetation in shallow lakes, its preferred habitat. It is widely distributed in sub-Saharan Africa. For the origin and pronunciation of the name, see Jacanidae.

<span class="mw-page-title-main">Cinnamon bittern</span> Species of bird

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<span class="mw-page-title-main">Reed cormorant</span> Species of bird

The reed cormorant, also known as the long-tailed cormorant, is a bird in the cormorant family Phalacrocoracidae. It breeds in much of Africa south of the Sahara, and Madagascar. It is resident but undertakes some seasonal movements.

<span class="mw-page-title-main">Red-billed teal</span> Species of bird

The red-billed teal or red-billed duck is a dabbling duck which is an abundant resident breeder in southern and eastern Africa typically south of 10° S. This duck is not migratory, but will fly great distances to find suitable waters. It is highly gregarious outside the breeding season and forms large flocks.

<span class="mw-page-title-main">White-fronted tern</span> Species of bird

The white-fronted tern, also known as tara, sea swallow, black-billed tern, kahawai bird, southern tern, or swallow tail, was first described by Johann Friedrich Gmelin in 1789. A medium-sized tern with an all-white body including underwing and forked tail, with grey hues on the over the upper side of the wing. In breeding adults a striking black cap covers the head from forehead to nape, leaving a small white strip above the black bill.

<span class="mw-page-title-main">Marsh tern</span> Genus of birds

The name marsh tern refers to terns of the genus Chlidonias, which typically breed in freshwater marshes, rather than coastal locations.

<span class="mw-page-title-main">Whiskered auklet</span> Species of bird

The whiskered auklet is a small seabird of the auk family. It has a more restricted range than other members of its genus, Aethia, living only around the Aleutian Islands and on some islands off Siberia, and breeding on these islands. It is one of the smallest alcids, only the closely related least auklet being smaller. Its name is derived from the long white feathers on its face that are part of its breeding plumage.

<span class="mw-page-title-main">Wandering tattler</span> Species of bird

The wandering tattler, is a medium-sized wading bird. It is similar in appearance to the closely related gray-tailed tattler, T. brevipes. The tattlers are unique among the species of Tringa for having unpatterned, greyish wings and backs, and a scaly breast pattern extending more or less onto the belly in breeding plumage, in which both also have a rather prominent supercilium.

<i>Gelochelidon</i> Genus of birds

Gelochelidon is a genus of terns. It was considered a monotypic genus until the Australian tern was split from the gull-billed tern.

<span class="mw-page-title-main">Antarctic tern</span> Species of bird

The Antarctic tern is a seabird in the family Laridae. It ranges throughout the southern oceans and is found on small islands around Antarctica as well as on the shores of the mainland. Its diet consists primarily of small fish and crustaceans. It is very similar in appearance to the closely related Arctic tern, but it is stockier, and it is in its breeding plumage in the southern summer, when the Arctic tern has shed old feathers to get its non-breeding plumage. The Antarctic tern does not migrate like the Arctic tern does, but it can still be found on a very large range. This tern species is actually more closely related to the South American tern.

<span class="mw-page-title-main">Large-billed tern</span> Species of bird

The large-billed tern is a species of tern in the family Laridae. It is placed the monotypic genus Phaetusa. It is found in most of South America. It has occurred as a vagrant in Aruba, Bermuda, Cuba, Panama and the United States. Its natural habitats are rivers and freshwater lakes.

<span class="mw-page-title-main">Australian tern</span> Species of bird

The Australian tern or Australian gull-billed tern is a tern in the family Laridae. The genus name is from Ancient Greek gelao, "to laugh", and khelidon, "swallow". It was previously considered conspecific with the gull-billed tern.

References

  1. BirdLife International (2019). "Gelochelidon nilotica". IUCN Red List of Threatened Species . 2019: e.T62026481A153842241. doi: 10.2305/IUCN.UK.2019-3.RLTS.T62026481A153842241.en . Retrieved 6 December 2021.
  2. Gmelin, Johann Friedrich (1789). Systema naturae per regna tria naturae : secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (in Latin). Vol. 1, Part 1 (13th ed.). Lipsiae [Leipzig]: Georg. Emanuel. Beer. p. 606.
  3. Latham, John (1785). A General Synopsis of Birds. Vol. 3, Part 2. London: Printed for Leigh and Sotheby. p. 356, No. 8.
  4. Hasselquist, Fredrik (1757). Iter Palæstinum, eller Resa til Heliga Landet, förrättad ifrån år 1749 til 1752 (in Swedish and Latin). Vol. 1757. Stockholm: Trykt på L. Salvii kåstnad. p. 273, No. 41.
  5. Bridge, E.S.; Jones, A.W.; Baker, A.J. (2005). "A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution". Molecular Phylogenetics and Evolution. 35 (2): 459–469. Bibcode:2005MolPE..35..459B. doi:10.1016/j.ympev.2004.12.010. PMID   15804415.
  6. Banks, R.C.; Cicero, C.; Dunn, J.L.; Kratter, A.W.; Rasmussen, P.C.; Remsen, J.V.; Rising, J.D.; Stotz, D.F. (2006). "Forty-Seventh Supplement to the American Ornithologists' Union Check-List of North American Birds". The Auk. 123 (3): 926–936. doi: 10.1093/auk/123.3.926 .
  7. 1 2 Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2022). "Noddies, gulls, terns, skimmers, skuas, auks". IOC World Bird List Version 12.2. International Ornithologists' Union. Retrieved 7 November 2022.
  8. Brehm, Alfred (1830). "Beschluss der Uebersicht der deutschen Vögel". Isis von Oken (in German and Latin). 23. cols 985–1013 [994].
  9. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp.  171, 272. ISBN   978-1-4081-2501-4.
  10. 1 2 3 "Gull-billed Tern". All About Birds. Cornell Lab of Ornithology.
  11. "Gull billed Tern (Gelochelidon nilotica)". Planet of Birds. 2011. Archived from the original on 2019-06-23. Retrieved 2011-10-20.
  12. Dunning, John B. Jr., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN   978-0-8493-4258-5.
  13. Sivakumar, S. (2004). "Gull-billed Tern Gelochelidon nilotica (Gmelin, 1789) feeding on insect road kills" (PDF). Newsletter for Ornithologists . 1 (1–2): 18–19.