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Chloephaga rubidiceps

Chloephaga rubidiceps, Photo: Arpingstone

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
Subfamilia: Tadorninae
Genus: Chloephaga
Species: Chloephaga rubidiceps

Chloephaga rubidiceps P.L. Sclater, 1861

PZS["1860"] Pt(28)3 p.387 pl.173

Vernacular names
čeština: Husice rudohlavá
Deutsch: Rotkopfgans
English: Ruddy-headed Goose
français: Ouette à tête rousse
magyar: Rőtesfejű lúd
日本語: チャガシラコバシガン

The ruddy-headed goose (Chloephaga rubidiceps) is a large sheldgoose, which breeds in southernmost South America.

It breeds on open grassy plains in Tierra del Fuego, Chile and the Falkland Islands. The South American birds are now very rare. They winter on lowlands in southern Argentina, some distance north of the breeding range. The Falklands population is resident.

The lined nest is built amongst grass tussocks, and 4-11 eggs are laid. This terrestrial species favours damp upland forest clearings and feeds by grazing; it rarely swims. It forms flocks outside the breeding season, often mixed with ashy-headed goose.

Ruddy-headed goose is a stocky 45–50 cm bird with a pale grey back, and black-barred rich buff underparts. The head and upper neck are chestnut brown. Sexes are similar, but immature birds are duller.

In flight this species shows black primaries, with the rest of the wing white except for a broad green bar. The male's call is a soft whistle, and the female's is a harsh cackle.

This species remains numerous in the Falklands,[2] despite competition from grazing cattle and sheep, but the South American population in Tierra del Fuego has been reduced to a few hundred birds not only by livestock farming, but especially predation by the South American gray fox, which was introduced to Tierra del Fuego in the 1950s to control rabbits.[3]

Under the auspices of the Convention on Migratory Species of Wild Animals (CMS), also known as the Bonn Convention, the Memorandum of Understanding (MoU) concerning conservation measures for the ruddy-headed goose was concluded and came into effect on 21 November 2006.

The continental population of the ruddy-headed goose is migratory and is in imminent danger of extinction because of the small size of its population, its restricted area of distribution, and the numerous threats which it faces in its breeding grounds in the continental area of the Magallenes region (Chile), in the north of the Tierra de Fuego (Argentina and Chile) and in the wintering grounds in the South of Buenos Aires province (Argentina). Therefore, the MoU aims to safeguard the mainland population of this species, which is in serious danger of extinction.

BirdLife International (2016). "Chloephaga rubidiceps". IUCN Red List of Threatened Species. 2016: e.T22679984A92837451. doi:10.2305/IUCN.UK.2016-3.RLTS.T22679984A92837451.en. Retrieved 11 November 2021.
"Falkland Islands State of the Environment Report 2008" (PDF). May 2008. Archived from the original (PDF) on 20 July 2011. Retrieved 29 August 2011.

Nowak, R. 1999. Walker's Mammals of the World, Sixth Edition. Baltimore: The Johns Hopkins University Press.

Wildfowl by Madge and Burn, ISBN 0-7470-2201-1

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