Among goldeneyes pair formation begins in midwinter, and until then the two sexes often form separate flocks. Indeed, male Common Goldeneyes winter farther north than do the females. During its courtship display, the male stretches his head forward along the water and then snaps it rapidly upward over his back, bill pointed skyward, while uttering a shrill, two-noted call. Then he swings his orange feet forward, sending up a small shower in front of him. The wings of this species produce a loud whistling sound in flight, easily identified even when the birds cannot be seen; hunters call this species the "Whistler." Goldeneyes can dive to depths of 20 feet (6 meters) or more, but generally limit themselves to about 10 feet (3 meters). In winter, goldeneyes feed mainly on mollusks; in summer, their diet shifts to aquatic plants and insects.

description 16-20" (41-51 cm). Male has white body; black back; black-appearing (actually glossy greenish) head; and large, round white spot in front of eye. Eye bright yellow. Female grayish, with warm brown head, white neck ring, and dark bill. Both sexes have a distinctive puffy head shape and a large white wing patch, conspicuous in flight. See Barrow's Goldeneye.

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