Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
覆盖鸟
身体,这些紧紧靠拢
片,为翅膀与尾部塑造出符合空气动力学
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.
覆盖鸟
身体,这些紧紧靠拢
片,为翅膀与尾部塑造出符合空气动力学
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.
在上,
枝以螺旋形绕著管状
芽生长,在管子
一侧接合在一起形成
轴,同时在管子
另一侧形成新
枝
。
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。