fledge
[flɛdʒ]
vi.
（鸟）长羽毛;
vt.
给（箭）装上羽毛;
把（小鸟）养到能够飞翔;
用羽毛[绒羽]装饰;
给…装上羽毛[绒毛];
例句:
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They fledge their young before the snows return.
来自BBC
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Young ravens take about six weeks to fledge.
来自Bird Watching
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Those people should accuse of using living animals like chickens or rabbits fledge boa.
用活的动物，例如小鸡或者兔子来喂养蟒蛇的人应该被谴责。
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The young then fledge in four to five weeks.
来自BBC