小型鸟类一年进行一到两次换羽，在换羽期间，它们一次会替换掉9到10根左右的飞羽，而这个过程将持续几周时间。
Small birds molt once or twice a year, and they replace their 9 or 10 primary flight feathers a few at a time over the course of a few weeks.
注：蛇雕的眼先及虹膜为黄色，飞羽及尾羽近末端各有一条白色宽横带。
Note: A Crested Serpent Eagle has a yellow lore, yellow iris and a white bar on primaries and tail.
嘴短而强健，呈圆锥形，稍向下弯；初级飞羽9 枚，外缘具两道淡色横斑。
Short and strong mouth, slightly bent downward, cone, Primary and outer ring, with two pale horizontal spot.
翼上初级飞羽呈现灰白色，翼前缘经常为淡棕色或黄棕色，比飞羽的深灰色要浅。
Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.
求偶方式主要有婚飞、显示饰羽、求偶喂食和象征性营巢行为；
The males courted the females by means of nuptial flight, displaying nuptial feathers, feeding and courtship nesting.
求偶方式主要有婚飞、显示饰羽、求偶喂食和象征性营巢行为；
The males courted the females by means of nuptial flight, displaying nuptial feathers, feeding and courtship nesting.
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