Moreover,duck feather structure possess good streamline to reduce the resistance when duck swims because of the slant flange on the cross section and barb at the end of feather. These result in the different capability when they are in water.

• 麻鸭腹部羽毛的剖面呈现倾斜的凸起结构且其羽毛末端上有倒钩,使其具备了良好的流线型结构,降低了水流的阻力。