Barrow's Goldeneye
Bucephala islandica
Adults are similar in appearance to the common goldeneye. On average, adult males are 49 cm (19.2 in) long and weigh 0.97 kg (2.13 lb); females are typically 43 cm (17 in) long and weigh 0.59 kg (1.31 lb). The Barrow's goldeneye has a wingspan of 70–73 cm (28–29 in). Adult males have a dark head with a purplish gloss and a white crescent at the front of the face. Adult females have a mostly yellow bill. Voice: The Barrow's goldeneye is a relatively quiet bird that generally only makes vocalizations during the breeding season and courtship. These can include low volume squeaks, grunts and croaks. During flights, the fast movement of the bird's wings creates a low whistling sound.
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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