One of the white-faced whistling ducks having a bath. Ducks can have a variety of poses when in the midst of a bath. I quite like this one. Also I think it's one of the few ducks where the sexes are difficult to tell apart. (unlike most of the ducks of North America)
White-faced whistling duck Dendrocygna viduata Tracy Aviary, Salt Lake City UT
Never heard of a whistling duck, do they actually make a sound simular to whistling or is that some odd name like purple finch that has a ref hue rather than purple?