Notes on the plumages and weights of the black-headed duck, Hateronetta atricapilla

Weller, M.W.

Condor 69(2): 133-145


ISSN/ISBN: 0010-5422
Accession: 025107094

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A study of the plumages of this parasitic duck was based on 105 museum skins, and 37 specimens collected in Argentina. Weights and measurements indicate that this sp. is unique among known anatids in that females are larger than males. The sequence of plumages is: natal, juvenal, 1st non-nuptial (basic), nuptial (alternate), 2nd non-nuptial. There is sexual but no seasonal dimorphism following ac-quisition of the 1st nuptial plumage. The 1st and later non-nuptial plumages are long-lived and function as a winter plumage. The complete molt occurs in mid-summer; a partial molt into nuptial plumage occurs in spring. On the basis of the shape of the juvenal tail feather, plumage color, and sequence of molt, a strong relationship to the Oxyurini is indicated.