Goldeneye , Bucephala clangula, Zvonec (Bucephala clangula)

Adult males ranges from 45–51 cm (18–20 in) and weigh approximately 1,000 g (2.2 lb), while females range from 40–50 cm (16–20 in) and weigh approximately 800 g (1.8 lb).[2] The common goldeneye has a wingspan of 30.3-32.7 in (77-83 cm). The species is named for its golden-yellow eye. Adult males have a dark head with a greenish gloss and a circular white patch below the eye, a dark back and a white neck and belly. Adult females have a brown head and a mostly grey body. Their legs and feet are orange-yellow.

Two subspecies are generally recognized, the nominate Eurasian subspecies Bucephala clangula clangula and the North American B. c. americana. americana has a longer and thicker bill than clangula.