Thalasseus sandvicensis (Information about this image)
Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis: Sarcopterygii
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Ordo: Charadriiformes
Subordo: Lari
Familia: Laridae
Subfamilia: Sterninae
Genus: Thalasseus
Species: Thalasseus sandvicensis
Name
Thalasseus sandvicensis (Latham, 1787)
Synonymy
Sterna sandvicensis (protonym)
Sterna cantiaca Gmelin, 1788
Sterna boysii Latham, 1790
See also
Thalasseus acuflavidus (syn. Thalasseus sandvicensis acuflavidus)
References
A General Synopsis of Birds, Supplement: 266 (description) 296 (name).
Vernacular names
Afrikaans: Grootseeswael
العربية: خرشنة الساندويش
asturianu: Chirri
azərbaycanca: Alaburun sterna
български: Гривеста рибарка
বাংলা: স্যান্ডউইচ পানচিল
brezhoneg: Skrav kuchenn
català: Xatrac becllarg
čeština: Rybák severní
Cymraeg: Morwennol bigddu
dansk: Splitterne
Deutsch: Brandseeschwalbe
Ελληνικά: Χειμωνογλάρονο
English: Sandwich Tern
Esperanto: Kresta ŝterno
español: Gaviotín Pico Amarillo
eesti: Tutt-tiir
euskara: Txenada hankabeltza
suomi: Riuttatiira
føroyskt: Faksaterna
Nordfriisk: Stianbaker
français: Sterne caugek
Gaeilge: Geabhróg Scothdhubh
Gàidhlig: Steàrnag Mhòr
galego: Carrán cristado
עברית: שחפית סנדוויץ'
hrvatski: Dugokljuna Čigra
Kreyòl ayisyen: Mòv kojèk
magyar: Kenti csér
íslenska: Þaraþerna
italiano: Beccapesci
日本語: サンドイッチアジサシ
ქართული: ჭრელნისკარტა თევზიყლაპია
қазақша: Айдарлы қарқылдақ
Lëtzebuergesch: Mierséischmuewel
lietuvių: Margasparnė žuvėdra
latviešu: Cekulzīriņš
македонски: Вртимушка
Malti: Ċirlewwa tax-Xitwa
Nederlands: Grote stern
norsk: Splitterne
polski: Rybitwa czubata
português do Brasil: Trinta-réis-de-bando
português: Trinta-réis-de-bando
rumantsch: Pestgarel piclapeschs
română: Chiră de mare
русский: Пестроносая крачка
slovenčina: Rybár sivý
slovenščina: Kricava cigra
shqip: Sterni dimërak
српски / srpski: Dugokljuna čigra
svenska: Kentsk tärna
Kiswahili: Shakwe Domo-rangimbili
Türkçe: Kara gagalı sumru
українська: Крячок рябодзьобий
中文: 白嘴端凤头燕鸥
The Sandwich tern (Thalasseus sandvicensis)[2] is a tern in the family Laridae. It is very closely related to the lesser crested tern (T. bengalensis), Chinese crested tern (T. bernsteini), Cabot's tern (T. acuflavidus), and elegant tern (T. elegans) and has been known to interbreed with the lesser crested. It breeds in the Palearctic from Europe to the Caspian Sea wintering to South Africa, India and Sri Lanka.
The Sandwich tern is a medium-large tern with grey upperparts, white underparts, a yellow-tipped black bill and a shaggy black crest which becomes less extensive in winter with a white crown. Young birds bear grey and brown scalloped plumage on their backs and wings. It is a vocal bird. It nests in a ground scrape and lays one to three eggs.
Like all Thalasseus terns, the Sandwich tern feeds by plunge diving for fish, usually in marine environments, and the offering of fish by the male to the female is part of the courtship display.
Taxonomy
Sandwich tern in flight
The terns are small to medium-sized seabirds, gull-like in appearance, but usually with a more delicate, lighter build and shorter, weaker legs. They have long, pointed wings, which gives them a fast buoyant flight, and often a deeply forked tail. Most species are grey above and white below, and have a black cap which is reduced or flecked with white in the winter.[3]
The Sandwich tern was originally described by ornithologist John Latham in 1787 as Sterna sandvicensis, but was recently moved to its current genus Thalasseus (Boie, 1822) following mitochondrial DNA studies which confirmed that the three types of head pattern (white crown, black cap, and black cap with a white blaze on the forehead) found amongst the terns corresponded to distinct clades.[2] The current genus name is derived from Greek Thalassa, "sea", and sandvicensis, like the English name, refers to Sandwich, Kent, Latham's type locality. In birds, the specific name sandvicensis usually denotes that the species was first described from Hawaii, formerly known as the "Sandwich Islands", but the Sandwich tern does not occur there.[4]
This bird has no subspecies. A former subspecies is now treated as a separate species called Cabot's tern (T. acuflavidus). It breeds on the Atlantic coasts of North America, northern and eastern South America, and has wandered to Western Europe.
Description
Eggs, Collection Museum Wiesbaden
This is a medium-large tern, 37–43 cm (15–17 in) long with an 85–97 cm (33–38 in) wingspan, which is unlikely to be confused within most of its range, although the South American race could be confused with the elegant tern. The Sandwich tern's weight ranges from 180-300 g (6.3-10.6 oz).[5]
The Sandwich tern's thin sharp bill is black with a yellow tip, except in the yellow or orange billed South American race. Its short legs are black. Its upperwings are pale grey and its underparts white, and this tern looks very pale in flight, although the primary flight feathers darken during the summer.[6]
Sandwich tern (left) among lesser crested terns
The lesser crested tern and elegant tern differ in having all-orange bills; lesser crested also differs in having a grey rump and marginally stouter bill, and elegant in having a slightly longer, more slender bill. The Chinese crested tern is the most similar to the Sandwich tern, but has a reversal of the bill colour, yellow with a black tip; it does not overlap in range with the Sandwich tern so confusion is unlikely.
In winter, the adult Sandwich tern's forehead becomes white. Juvenile Sandwich terns have dark tips to their tails, and a scaly appearance on their back and wings, like juvenile roseate terns.[6]
The Sandwich tern is a vocal bird; its call is a characteristic loud grating kear-ik or kerr ink.[6]
Behaviour
This species breeds in very dense colonies on coasts and islands, and exceptionally inland on suitable large freshwater lakes close to the coast. It nests in a ground scrape and lays one to three eggs. Unlike some of the smaller white terns, it is not very aggressive toward potential predators, relying on the sheer density of the nests—often only 20–30 cm (7.9–11.8 in) apart and nesting close to other more aggressive species such as Arctic terns and black-headed gulls to avoid predation.
Like all Thalasseus terns, the Sandwich tern feeds by plunge-diving for fish, almost invariably from the sea. It usually dives directly, and not from the "stepped-hover" favoured by Arctic terns. The offering of fish by the male to the female is part of the courtship display.
Status
The Sandwich tern has an extensive global range estimated at 100,000–1,000,000 km2 (39,000–386,000 sq mi). It has a population estimated at 460,000–500,000 individuals. Population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e., declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as least concern.[1]
The Sandwich tern is among the taxa to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.[7] Parties to the agreement are required to engage in a wide range of conservation actions which are describes in a detailed action plan. This plan should address key issues such as species and habitat conservation, management of human activities, research, education, and implementation.[8]
References
BirdLife International (2019). "Thalasseus sandvicensis". IUCN Red List of Threatened Species. 2019: e.T22694591A154517364. doi:10.2305/IUCN.UK.2019-3.RLTS.T22694591A154517364.en. Retrieved 19 November 2021.
Bridge, Eli S.; Jones, Andrew W.; Baker, Allan 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. doi:10.1016/j.ympev.2004.12.010. PMID 15804415.
Snow, David; Perrins, Christopher M., eds. (1998). The Birds of the Western Palearctic (BWP) concise edition (2 volumes). Oxford: Oxford University Press. p. 764. ISBN 0-19-854099-X.
Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 347, 383. ISBN 978-1-4081-2501-4.
"Sandwich Tern Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 2020-09-25.
Hume, R. (2002). RSPB Birds of Britain and Europe. London: Dorling Kindersley. pp. 186. ISBN 0-7513-1234-7.
"Annex 2: Waterbird species to which the Agreement applies". Agreement on the conservation of African-Eurasian migratory Waterbirds (AEWA). UNEP/ AEWA Secretariat. Retrieved 28 May 2016.
"Introduction". African-Eurasian Waterbird Agreement. UNEP/ AEWA Secretariat. Retrieved 28 May 2016.
Further reading
Olsen, Klaus Malling; Larsson, Hans (1995). Terns of Europe and North America. London: Christopher Helm. ISBN 0-7136-4056-1.
Stienen, Eric W.M. (2006). Living with gulls: trading of food and predation in the Sandwich Tern Sterna sandvicencis (PhD Thesis). University Groningen. hdl:11370/51438613-1ca3-4f4c-8cf1-5933785422a7.
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