Domestic ducks are waterfowl with strong motivations to immerse their bills, preen, and swim, making the waterless or water-restricted environments of most commercial duck farms a significant source of chronic welfare deprivation.
Ducks kept without water access for immersion show behavioral indicators of frustration and develop eye problems from inability to clean their eyes naturally. The motivation to bathe is so strong that ducks will use whatever water is available intensively, even when open water is first provided to previously water-deprived animals. The welfare cost of water deprivation in commercial ducks is well-documented and the provision of open water is inexpensive relative to production costs.