fulvous whistling duck or fulvous tree duck dendrocygna bicolor standing in the grass

africa african animal avian beak bicolor bird captive close closeup dendrocygna drake duck environment face fauna feather feathered fowl fulvous goose grass green group head kruger lake national nature one ornithology plumage pond profile reserve south standing tree ulvous wading water waterfowl wetland whistling white wild wildlife zoo