Bufflehead
Bucephala albeola
The bufflehead ranges from 32–40 cm (13–16 in) long and weighs 270–550 g (9.5–19.4 oz), with the drakes larger than the females. Averaging 35.5 cm (14.0 in) and 370 g (13 oz), it rivals the green-winged teal as the smallest American duck. The bufflehead has a wingspan of 21.6 in (55 cm). Adult males are striking black and white, with iridescent green and purple heads and a large white patch behind the eye. Females are grey-toned with a smaller white patch behind the eye and a light underside.
ID text from Wikipedia, CC BY-SA 4.0
Common Goldeneye
Bucephala clangula
Adult males range 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). The common goldeneye has a wingspan of 77–83 cm (30.5–32.5 in). The species is named for its golden-yellow eyes. 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. The subspecies B. c. americana has a longer and thicker bill than the nominate B. c.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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