Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
羽覆盖鸟
身体,这些紧紧
羽片,为翅膀与尾部塑造出符
空气动力学
身体表面。
Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
羽覆盖鸟
身体,这些紧紧
羽片,为翅膀与尾部塑造出符
空气动力学
身体表面。
In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.
羽上,羽枝以螺旋形绕著管状
羽芽生长,
管子
侧接
起形成羽轴,同时
管子
另
侧形成新
羽枝脊。
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。