The Canvasback (Aythya valisineria) is a species of diving duck, the largest found in North America. It ranges from 48–56 centimetres (19–22 in) in length and weighs 862–1,588 grams (1.900–3.501 lb), with a wingspan of 79–89 centimetres (31–35 in). The Canvasback has a distinctive wedge-shaped head and long graceful neck. The adult male (drake) has a black bill, a chestnut red head and neck, a black breast, a grayish back, black rump, and a blackish brown tail. The drake's...