On tidal marshes, black ducks turn more carnivorous, eating mussels, clams, snails, and crustaceans. Unlike many other species of waterfowl, black ducks don’t wait until late winter or early ...

and 17 American black ducks. The study reports, “Regardless of species, all samples contained detectable levels of PCBs and at least one OCP and PFAS. Mercury and OCPs posed limited non-cancer ...