Although male ring-necked ducks superficially resemble their counterparts in greater and lesser scaup, their peaked, angular head profile, distinctive white bill markings and uniformly dark upper wings distinguish them. Female ring-necked ducks most closely resemble female redheads, but are distinguished by their smaller size; peaked, angular head profile; and pale region around the face. Male ring-necked ducks have an iridescent black head, neck, breast and upperparts. The belly and flanks are whitish to grayish, with a distinctive triangular white wedge extending upward in the area in front of the folded wing. The bill is slate with a white border around the base and nares, and a pale white band behind the black tip.
The “ringneck” name is derived from a faint brownish ring around the base of the neck, which is visible only upon close inspection. The legs and feet are gray-blue and the iris is yellow. Ring-necked ducks are silent except in display, when a low whistling note is uttered. Female ring-necked ducks have a brown head with a black crown, light brown cheeks and chin and a white eye ring. A narrow white line extends from the eye to the back of the head. The bill is slate with a faint white band near the tip. The neck, back, sides and flanks are brown and the belly is white. The legs and feet are gray-blue and the iris is brown. Female vocalizes a soft, rolling “trrr.”
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