Black-bellied Whistling-Duck, Dendrocygna autumnalis, Asa-branca
(Photo by Maria Bedacht, taken in Campinas, São Paulo, Brazil - Dec 2004.)
This somewhat odd duck was described by Linnaeus in 1758. (See: Birds in Brazil, H. Sick - pg 160). Named for its whistling like call, it is also known as a Tree Duck in some places, due to its propensity for hanging out in the branches, as shown.
