然而，羽毛的稀疏分布也使得皮肤表面形成相当大量的侧向空气流动，从而可以通过对流进一步散热。
The sparse distribution of the feathers, however, also allows considerable lateral air movement over the skin surface, thereby permitting further heat loss by convection.
根据传统理论，鳞片变成羽毛的第一步是先拉长，接著长出流苏般的边缘，最后产生有小钩与沟槽的羽小枝。
According to this scenario, scales became feathers by first elongating, then growing fringed edges, and finally producing hooked and grooved barbules.
但更进一步的检查表明这其实是骨骼和软组织，上面覆盖著精美的羽毛。
But closer inspection showed that it was actually bone and soft tissue covered with delicate feathers.
下面我将一步步展示我是如何绘制一根羽毛的。
A step by step walk-through of how I made the feather shown below.
下面我将一步步展示我是如何绘制一根羽毛的。
A step by step walk-through of how I made the feather shown below.
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