The West African crested tern (''Thalasseus albididorsalis'') is a

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

species in the family Laridae. Until 2020 it was considered a subspecies of the New World

royal tern The royal tern (''Thalasseus maximus'') is a tern in the family Laridae. The species is endemic to the Americas, though strays have been identified in Europe.Buckley, P. A. and F. G. Buckley (2020). Royal Tern (Thalasseus maximus), version 1.0. ...

, ''Thalasseus maximus''.R. Terry Chesser, Shawn M. Billerman, Kevin J. Burns, Carla Cicero, Jon L. Dunn, Andrew W. Kratter, Irby J. Lovette, Nicholas A. Mason, Pamela C. Rasmussen, J. V. Remsen, Jr., Douglas F. Stotz, and Kevin Winker. "Sixty-first supplement to the American Ornithological Society’s ''Check-list of North American Birds''". ''The Auk'' 2020, vol. 137:1-24 retrieved July 1, 2020

Taxonomy and systematics

The West African crested tern was long thought to be a subspecies of royal tern. A study published in 2005 showed that it is more closely related to the

lesser crested tern The lesser crested tern (''Thalasseus bengalensis'')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 Ph ...

(''Thalasseus bengalensis'').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: 459–469. A 2017 publication expanded on those results. In the summer of 2020 the

American Ornithological Society The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its m ...

and

International Ornithological Committee The International Ornithologists' Union, formerly known as the International Ornithological Committee, is a group of about 200 international ornithologists, and is responsible for the International Ornithological Congress and other international ...

accepted it as a full species.

Description

The West African crested tern is among the largest of the crested terns. Its tail is forked and the adult's bill is long and orange. Its mean mass is with a wingspan between and . In breeding plumage its underside is white and upper parts pale gray; the top of the head is black with a shaggy crest at the rear. The primary feathers are tipped with black. The adult's legs are black. The non-breeding adult plumage is similar except that the black on the head is confined to the crest. Juveniles have variable plumage. The underside is white and the upper parts streaked and blotched. The bill is smaller and pale yellow; the legs are seldom black but can be green, yellow, or pink.Buckley, P. A. and F. G. Buckley (2020). Royal Tern (Thalasseus maximus), version 1.0. In Birds of the World (S. M. Billerman, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.royter1.01 Retrieved April 17, 2021

Distribution

The West African crested tern is known to breed only on a few islands off the coast of Africa between

Mauritania Mauritania (; ar, موريتانيا, ', french: Mauritanie; Berber: ''Agawej'' or ''Cengit''; Pulaar: ''Moritani''; Wolof: ''Gànnaar''; Soninke:), officially the Islamic Republic of Mauritania ( ar, الجمهورية الإسلامية ...

and

Senegambia The Senegambia (other names: Senegambia region or Senegambian zone,Barry, Boubacar, ''Senegambia and the Atlantic Slave Trade'', (Editors: David Anderson, Carolyn Brown; trans. Ayi Kwei Armah; contributors: David Anderson, American Council of Le ...

, though it is suspected to also breed as far east as

Nigeria Nigeria ( ), , ig, Naìjíríyà, yo, Nàìjíríà, pcm, Naijá , ff, Naajeeriya, kcg, Naijeriya officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf o ...

. In the non-breeding season it can be found along the coast from

Morocco Morocco (),, ) officially the Kingdom of Morocco, is the westernmost country in the Maghreb region of North Africa. It overlooks the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to ...

Namibia Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and ea ...

Diet

Like all ''Thalasseus'' terns, the West African crested tern feeds by plunge-diving for fish and shrimp, usually in shallow coastal and tidal waters. It usually dives directly, and not from the "stepped-hover" favored by

Arctic tern The Arctic tern (''Sterna paradisaea'') is a tern in the family Laridae. This bird has a circumpolar breeding distribution covering the Arctic and sub-Arctic regions of Europe (as far south as Brittany), Asia, and North America (as far south a ...

. Its known foods include members of the herring family, mullet, grunts, jacks, and

spadefish Ephippidae is a family containing the spadefishes, with about eight genera and a total of 20 marine species. Well-known species include the Atlantic spadefish (''Chaetodipterus faber'') and the reef-dwelling genus ''Platax'', the batfishes, whic ...

Status

The

IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

has not evaluated the West African crested tern's status.

References

{{Taxonbar

West African crested tern The West African crested tern (''Thalasseus albididorsalis'') is a bird species in the family Laridae. Until 2020 it was considered a subspecies of the New World royal tern, ''Thalasseus maximus''.R. Terry Chesser, Shawn M. Billerman, Kevin J. B ...

Birds of West Africa