moulting
v. 换羽,脱毛( moult的现在分词 ); <喻>去掉(旧习惯、观点等)
When an animal or bird moults, it gradually loses its coat or feathers so that a new coat or feathers can grow.
Finches start to moult at around twelve weeks of age.
燕雀大约在12个星期大小的时候开始换羽毛。
1. periodic shedding of the cuticle in arthropods or the outer skin in reptiles