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.

• 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。