The crested duck (Lophonetta specularioides) a duck native to South America, is truly striking with its powder-puff of feathers on its head. Crested Ducks have naturally-deformed skulls that give it a physical "crest" on the top of its head. Crests should be large and sit symmetrically on the duck's head. The crest arose from a genetic mutation specifically bred into the bird by duck breeders. The Crested duck breed is distantly related to other ducks and is directly descended from the Mallard duck breed.