The American Black Ducks are probably the most common ducks seen on the marsh. Some of them spend the winter out on the Annapolis River, and return to the marsh when the ice goes out. The males and females look very similar, unlike other ducks. The different colored bills help to distinguish between the sexes: the males have yellowish bills, with the bills of the females being more olive-colored. This trio was perched on a fallen tree on June 13th, with a female passing by . . . Note their purple speculums, the patches of color on their wing feathers.
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