ferruginous duck (aythya nyroca)

anatidae animal anseriformes aves aythya aythyinae beak bill bird brown captive chordata conservation creature diving duck ecology ente environment eurasia european feathers ferruginous fowl fudge head lake male moorente nature nyroca ornithology pochard pond quack rostrum rufous schnabel swimming vertebrate warmblooded water waterfowl wet wetlands wildlife zoology