University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Waterfowl of North America, Revised Edition (2010) Papers in the Biological Sciences 2010 Waterfowl of North America: WHISTLING DUCKS Tribe Dendrocygnini Paul A. Johnsgard University of Nebraska-Lincoln,
[email protected] Follow this and additional works at: https://digitalcommons.unl.edu/biosciwaterfowlna Part of the Ornithology Commons Johnsgard, Paul A., "Waterfowl of North America: WHISTLING DUCKS Tribe Dendrocygnini" (2010). Waterfowl of North America, Revised Edition (2010). 8. https://digitalcommons.unl.edu/biosciwaterfowlna/8 This Article is brought to you for free and open access by the Papers in the Biological Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Waterfowl of North America, Revised Edition (2010) by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. WHISTLING DUCKS Tribe Dendrocygnini Whistling ducks comprise a group of nine species that are primarily of tropical and subtropical distribution. In common with the swans and true geese (which with them comprise the subfamily Anserinae), the included spe cies have a reticulated tarsal surface pattern, lack sexual dimorphism in plum age, produce vocalizations that are similar or identical in both sexes, form relatively permanent pair bonds, and lack complex pair-forming behavior pat terns. Unlike the geese and swans, whistling ducks have clear, often melodious whistling voices that are the basis for their group name. The alternative name, tree ducks, is far less appropriate, since few of the species regularly perch or nest in trees. All the species have relatively long legs and large feet that extend beyond the fairly short tail when the birds are in flight.