Adult harlequin duck (Histrionicus histrionicus) in full breeding plumage in the calm waters of Lake Myvatn, Iceland

harlequin duck waterfowl breeding plumage lake myvatn iceland wildlife nature birdwatching aquatic birds swimming colorful feathers splashing male avian migratory wetlands habitat biodiversity ornithology peaceful waters animal behavior natural setting patterns ecology birdlife water conservation shorebirds unique species enthusiasts observation spring season beauty colors feather details flapping wings calm environment