molt

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Like other penguins, it undergoes an annual molt, replacing all its feathers in a few weeks.
与其它企鹅一样，它每年蜕一次毛，全部代以新生的羽毛。
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.
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。
So what if you want to fly? University of Washington scientists say it depends on how fast you can replace your flight feathers when you molt.
那么，你如果想飞，你的体重该保持在什么水平上呢？华盛顿大学的科学家们说，这取决于你在换羽期间更换飞羽的速度。

They shed all their feathers during an annual molt, which the New Zealand penguin had been doing when found.
NPR: Penguin Found Stranded On New Zealand Beach Dies
When I found her this morning, she was mid-molt, her old skin split across her back and her new body wiggling slowly out of it.
FORBES: Books And Mantids
This particular male has reached his final molt, clear to me because he now has wings to help him get to where the girls are.
FORBES: Books And Mantids