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1. The birds are migrating to their summer homes in the south during the moulting season.
在换羽季节，鸟儿们正迁徙到南方的夏季栖息地。
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2. During the moulting season, many animals shed their old feathers and grow new ones.
换羽季节期间，许多动物会脱去旧羽毛并长出新羽毛。
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3.This species of bird has a unique way of molting its feathers, which helps it survive in harsh environments.
这种鸟类有一种独特的换羽方式，这有助于它在恶劣环境中生存。