- an Australian duck (Biziura lobata) with an inflatable leathery pouch beneath the lower jaw, spikelike tail feathers, and a musklike odor during the breeding season
- Muscovy duck
- See Muscovy duck.
- An Australian duck (Biziura lobata), the male of which has a leathery chin lobe and emits a musky odor during the breeding season.
(plural musk ducks)