Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
羽覆盖鸟的身体,这些紧紧靠拢的羽片,为翅膀塑造出符合空气动力学的身体表面。
Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
羽覆盖鸟的身体,这些紧紧靠拢的羽片,为翅膀塑造出符合空气动力学的身体表面。
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,羽枝以螺旋形绕著状的羽芽生,子的一侧接合一起形成羽轴,同时子的另一侧形成新的羽枝脊。
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