Any of several dark-gray aquatic birds of the genus Fulica of North America and Europe,having a black head and neck,lobed toes,and a white bill.

• 白骨顶任一种原产于北美洲和欧洲的白骨顶属深灰色水鸟，头颈均为黑色，足有瓣蹼，喙呈白色。