According to “Avian Hybrids of the World”, by Dr Eugene M. McCarthy, muscovies have crossed with the Swan Goose (domestic form is Chinese Goose). Hybrids are of very low or zero fertility. Today, one of my kids in Laos sent me photos of a Chinese Goose gander mating, apparently successfully, with a female Muscovy, and a male Muscovy mating, again, apparently successfully, with female Chinese goose. No reports of offspring yet.
