In particular, duck vaginas are often equipped with additional passages that have blind endings, and frequently corkscrew in a clockwise direction, in contradistinction to the anticlockwise thread of a drake's penis.
In particular, duck vaginas are often equipped with additional passages that have blind endings, and frequently corkscrew in a clockwise direction, in contradistinction to the anticlockwise thread of a drake's penis.
事实上，母鸭的阴道有很多具有顺时针螺纹的憩室，而对比来看公鸭的阴茎则有逆时针的螺纹。