Canvasback ducks measure 19 to 24 inches and weigh 3 to 5.6 pounds. Males have a dark reddish head and neck, grading to blackish on the face and crown. The mid-back is white with brownish black on the rump and upper tail coverts. The underparts are white with some black. Females have the same color head as males, but with more buff around the eyes and on the cheeks. Most of the upperparts are dark brown. The canvasback is primarily a fresh water pochard or diving duck and is not adept at walking on land. Its feet are farther back on the body and have large webs.