leucistic female mallard duck with partial loss of pigmentation with a male drake mallard

albinism albino anas anatidae animal anseriformes beak bird colour condition curious dabbling drake duck ducks environment fauna feather female gene genetic hen iridescent lake leucism leucistic leucitic loss male mallard mallards manky mutation nature ornithology outdoor outdoors partial pigmentation platyrhynchos plumage pond rare reflection reflections river variation watching wetland wild wildlife