Buffleheads are the smallest of all the ducks. Like wood ducks, they nest in tree cavities, often in the former nest site of a woodpecker. From a distance the males appear to have a black head with a large white spot on the back of the head. In reality, though, the head is not black, but a dark iridescent green which can also change to other colors depending on the light. Males seem more cautious than females and will rarely come very close to where I am standing, while the females seem less wary.
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