Black Ducks differ from female Mallards in a number of respects. The throat of a Black Duck is grayish and streaked. The throat also contrasts markedly from the dark breast. Furthermore, its olive bill is relatively unmarked, unlike a Mallard's yellowish, splotchy bill. You can see the difference in the third photo. (A male Mallard has a clear, yellowish bill, like the one in the forth picrture.) American Black Ducks are interesting birds, as I have previously posted.
Two white, domestic ducks swam among the geese and Mallards. Almost all domestic ducks are derived from Mallards. Feral populations of domestic ducks are a relatively common encounter. White birds often breed back with wild ones. Although often free flying like the birds I found, domestic ducks can not be included on birders’ checklists. There are rules about GMOs, you know.

















