蓝灰色嘴的北美洲潜鸭。
Diving ducks of North America having a bluish-gray bill .
北美洲的潜鸭，灰黑色身体和红褐色头。
North American diving duck with a gray-and-black body and reddish-brown head .
美洲潜鸭美洲潜鸭美洲潜鸭