Female common goldeneye ducks swimming and diving
Four female common goldeneye ducks (Bucephala clangula) swimming and diving in the Lamar River on a cold winter day in February. Common goldeneyes are medium-sized, migratory diving ducks with triangular heads and sloping bills. Males are slightly larger than females and have a brilliant greenish-black head with a distinctive white spot behind their black bill. The male's chest, sides, and belly, and secondary feathers are white, while his back, wings, and tail are black. Females have more muted plumage. Filmed in the Lamar Valley, Yellowstone National Park, Wyoming, USA.