Common eiders are the largest duck found in the northern hemisphere. They are stocky, thick-necked birds that hold their heads below body level during flight. Male common eiders have a primarily white head, neck, chest and back. The breast, belly, sides, rump, tail coverts and tail are black. The crown and forehead have a black cap, while the cheeks are pale green and are used in breeding displays. A white round spot occurs on the black flank just forward of the tail. The head has a distinct sloping profile. The bill is olive-gray, turning yellowish near the facial area, and the legs and feet are grayish-green. Female common eiders are russet-brown to gray. All are heavily barred with dark brown lines on their backs, chests, breasts, sides and flanks. The head has a distinct sloping profile. The bill is olive-gray to olive-yellow and the legs and feet are grayish.
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