Use of Muscovy Ducks: Muscovies love foraging on pasture, where they convert slugs, snails, mosquitoes, weeds, tender grass, berries and other edibles into tasty, lean meat and eggs. Muscovy females only lay around 50 to 100 eggs a year, but they make devoted broody birds that will gladly set their own eggs, as well as those belonging to other waterfowl, and vigorously defend their young from perceived enemies. These birds can make friendly, fascinating pets, too. Photo by Rhoda Peacher.