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Hartlaub's DuckThe perching ducks ("Cairininae" or "Cairinini") were previously treated as a small group of ducks in the duck, goose and swan family Anatidae, grouped together on the basis of their readiness to perch high in trees. It has been subsequently shown that the grouping is paraphyletic and their apparent similarity results from convergent evolution, with the different members more closely related to various other ducks than to each other (Livezey 1986).

The species previously included, and their current subfamilial allocation, are:


Plectropterinae


Tadorninae


Anatinae


In addition, several species cannot with certainty be allocated to a subfamily, though they do not form a distinct clade. Rather, their characters are too ambiguous to allow unequivocal placement based on the available data (Livezey 1986, Sraml et al. 1996, Johnson & Sorenson 1999):


Copyright: Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia.org




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