换羽（molting） 是指羽毛的定期更换，是鸟类的一个重要的生物学现象。换羽可以使羽毛长年保持完好，并能应对羽毛的损伤。在亲缘关系接近的鸟之间有类似的换羽规律，这对于研究系统分类羽进化有着重要的意义
... 换羽 to molt; to change feathers 换羽 to molt; to change feathers 库羽虱属 cuclotogaster ...
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鸟的羽毛不会永远光洁如新，鸟类必须周期性的进行换羽，长出新的羽毛。
Feathers don't last forever. So birds periodically shed their plumage and then sprout replacements.
一些大型鸟类，像是大雁或是体重能够达到30磅的天鹅，是以放弃飞行能力来解决换羽的难题的。
Some large birds, like honking big geese and 30-pound swans, get around the problem by forgoing flight while they get all their molting over with in one fell swoop.
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.
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