少量的会保留一点皮肤，更少量的一些化石则保留了一些像羽毛的结构，不过时至今日，科学家们对此仍然存在争论。
A few preserve traces of skin, and fewer still preserve structures that many scientists have argued are feathers.
“这些像胡须的东西就是羽毛，”他说。
天鹅们飞落在地上，相互吹着气，吹掉了身上的全部羽毛，接着，它们的天鹅皮也像脱去衬衫一样从身上脱落了。
Landing on the floor, they blew on one another, and blew all their feathers off. Then their swan-skins came off just like shirts.
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