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Anas flavirostris

Anas flavirostris, Photo: Duncan Wright(*)

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
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
Subordo: 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: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Pangalloanserae
Cladus: Galloanseres
Ordo: Anseriformes

Familia: Anatidae
Genus: Anas
Species: Anas flavirostris
Subspecies: A. f. flavirostris – A. f. oxyptera

Anas flavirostris Vieillot, 1816

Vieillot, L.J.P. 1816. Nouveau Dictionnaire d’Histoire naturelle, appliquée aux arts, à l'agriculture, à l'économie rurale et domestique, à la médecine, etc. Par une société de naturalistes et d'agriculteurs. Avec des figures tirées des trois règnes de la nature. Tome 5. 614 pp. + 9 tt. Déterville, Paris. P.107 BHL Reference page.

Vernacular names
čeština: Čírka kropenatá
English: Yellow-billed Teal
español: Cerceta Barcina
français: sarcelle à bec jaune
日本語: キバシコガモ
Nederlands: Chileense Taling
norsk: Gulnebbkrikkand
svenska: Gulnäbbad kricka

The yellow-billed teal (Anas flavirostris) is a South American species of duck. Like other teals, it belongs to the diverse genus Anas; more precisely it is one of the "true" teals of subgenus Nettion.[2][3][4] It occurs in Argentina, the Falkland Islands, Chile, Peru, Bolivia, Uruguay, and Brazil. It has also established itself in South Georgia, where it was first recorded breeding in 1971, and has been recorded as far east as Tristan da Cunha. It inhabits freshwater wetlands, preferring palustrine habitat to rivers. Considering its wide range and local abundance, it is not considered threatened by the IUCN.[1][5]


The namesake bill is bright yellow with a black tip and a black band along the ridge of the culmen. [6] The species is somewhat similar to the larger yellow-billed pintail, but has a darker head, shorter neck and plain grayish sides. [7]

A. f. oxyptera in Peru

A. f. oxyptera in Peru


Mitochondrial DNA sequence data is most similar to that of the very different-looking green-winged teal.[note 1] Apart from the mystifying relationship with the red-and-green-headed teals, it altogether most resembles the Indian Ocean radiation of teals. However, the yellow-billed teal's unicolored underside and namesake bill are unique, as is to be expected from a species that evolved half a world apart from Bernier's or the grey teal.[2]

This species is also unique among its relatives in some aspects of its post-copulation behavior: After dismounting, the drakes stretch themselves up high and swim around and alongside the females.[4]

Traditionally, there are 2 subspecies:

Sharp-winged teal, Anas flavirostris oxyptera (Meyen, 1834) – highlands of central Peru to northern Chile and Argentina.
Chilean teal, Anas flavirostris flavirostris (Vieillot, 1816) – southern South America as far north as southern Brazil and northern Argentina. Also in the Falkland Islands.

Previously, this species and the Andean teal formed the superspecies speckled teal, but increasingly taxonomists consider the two species distinct.[8]

Johnson & Sorenson (1999); see there for a discussion of the crecca-carolinensis-flavirostris group's phylogeny.


BirdLife International (2016). "Anas flavirostris". IUCN Red List of Threatened Species. 2016: e.T22736320A95130607. doi:10.2305/IUCN.UK.2016-3.RLTS.T22736320A95130607.en. Retrieved 12 November 2021.
Carboneras, Carles (1992). "77. Speckled Teal". In del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi (eds.). Handbook of Birds of the World, Volume. 1: Ostrich to Ducks. Barcelona: Lynx Edicions. pp. 603, plate 45. ISBN 84-87334-10-5.
Johnson, Kevin P. & Sorenson, Michael D. (1999). "Phylogeny and biogeography of dabbling ducks (genus Anas): a comparison of molecular and morphological evidence" (PDF). Auk. 116 (3): 792–805. doi:10.2307/4089339. JSTOR 4089339.
Johnson, Kevin P. McKinney, Frank; Wilson, Robert & Sorenson, Michael D. (2000). "The evolution of postcopulatory displays in dabbling ducks (Anatini): a phylogenetic perspective" (PDF). Animal Behaviour. 59 (5): 953–963. doi:10.1006/anbe.1999.1399. PMID 10860522. S2CID 28172603.
Accordi, Iury Almeida; Barcellos, André (2006). "Composição da avifauna em oito áreas úmidas da Bacia Hidrográfica do Lago Guaíba, Rio Grande do Sul" [Bird composition and conservation in eight wetlands of the hydrographic basin of Guaíba lake, State of Rio Grande do Sul, Brazil] (PDF). Revista Brasileira de Ornitologia (in Portuguese and English). 14 (2): 101–115.
"Yellow-billed Teal (Anas flavirostris)". Peru Aves.
"Yellow-billed Teal". eBird.
Remsen, Van (2008). "Treat Anas andium as a separate species from Anas flavirostris". South American Classification Committee. Retrieved 27 April 2008.

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