Muscovy ducks. The Muscovy (Cairina moschata) is distinctly different genetically from common ducks. This breed is believed to have originated in South America, although ancient records of this or a similar breed have been found in Egypt. There are both colored and white feathered varieties of Muscovies. The Sudani is a breed of Muscovy found in Egypt. Unlike common ducks, the head and face of Muscovies is covered with caruncles (a fleshy growth that resembles wattles). Another prominent feature of Muscovy ducks is the large difference in body size between the drake and the duck, the male weighing 30-50% more than the female. Muscovies tolerate hot weather much better than common ducks. Muscovy eggs require about 35 days to hatch. While Muscovies can be crossed with common ducks, their offspring are sterile