10. A small North American diving duck(Bucephala albeola) having black and white plumage and a densely feathered, rounded head.

• 巨头鹊鸭一种体型小的北美潜水鸭（巨头鹊鸭），有黑白色的羽毛和稠密的毛，圆脑袋收藏指正