The Ringed Teal is a small duck of South American forests. It is the only species of the genus Callonetta. Usually placed with the dabbling ducks (Anatinae), this species may actually be closer to shelducks and belong in the subfamily Tadorninae; its closest relative is possibly the Maned Duck. The male and female remain colorful throughout the year, lacking an eclipse plumage. The drake has a rich chestnut back, pale grey flanks and a salmon-colored breast speckled in black. A black band runs from the top of its head down to the nape. Females have an olive-brownish back with the head blotched and striated in white, with penciled barring on a pale chest and belly. Both have a dark tail, a contrasting pale rump, and a distinctive white patch on the wing. Bills are grey and legs and feet are pink in both sexes. Pairs easily bond. Their contact calls are a cat-like mee-oowing in ducks, a lingering peewoo in drakes. (information from Wikipedia)
These birds were spotted at National Zoo in Washington, D.C.. I wish these were better images, but it was late in the day and the natural light in the building was fading.