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coscoroba swan
The coscoroba swan (''Coscoroba coscoroba'') is a species of waterfowl endemic to southern South America. It is the smallest of the birds called "swans", but still a large species of waterfowl. It belongs to the subfamily Anserinae in the family of ducks, swans, and geese, Anatidae. It is placed in the monotypic genus ''Coscoroba''. The coscoroba swan is traditionally considered as an early branch from the common ancestor leading to true geese and swans, and recently genetic studies have associated a phylogenetic relationship between this species and Cape Barren goose (''Cereopsis novaehollandiae'') as sister groups.〔Rodrigues, B.S. ''et al''. (2014) (Chromosomal studies on ''Coscoroba coscoroba'' (Aves: Anseriformes) reinforce the ''Coscoroba''–''Cereopsis'' clade ). ''Biological Journal of the Linnean Society'', 111: 274–279.〕
== Description ==
Male coscoroba swans weigh and females weigh . The length is from and the wingspan is .〔del Hoyo, J. Elliott, A. & Sargatal, J. (1992) Handbook of the Birds of the World. Volume 1: Ostrich to Ducks. Lynx Edicions. ISBN 84-87334-10-5.〕 They have white plumage except for black tips to the outer six primary feathers, although this black is often barely visible on the closed wing. In flight, the black wing tips are conspicuous. The bird has a red beak, legs and feet. They look somewhat more like geese than swans. The female looks almost identical to the male. The cygnet is a patchy color, with brown and gray hues. The coscoroba swan is also lacking the black mask that other swans have where their lores are between the eyes and beak. They look like a very small swan in body and look like a goose in the head.Eggs have a measure 89 X 61 mm, with averages of 82 to 94 53 to 67 mm, with an average weight of 170 grams and range from 129 to 203 grams
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