Intriguingly, not all of them seem to come from birds.
有趣的是,这些羽毛并不都属于鸟类。
The origin of feathers is a mystery.
羽毛的起源一直是个谜。
The earliest known bird, Archaeopteryx, lived during the Jurassic, the period before theCretaceous.
人类所熟知的最古老鸟类始祖鸟生活在白垩纪时期之前的侏罗纪时期。
But fossils from China suggest the precursors of feathers-simple, filament-like structurespossibly used for insulation-evolved in land-lubbing dinosaurs and were only later adapted forflight.
中国出土的化石表明羽毛的前身呈简易的丝状结构,可能具有隔离热量的功用,这些简易丝状羽毛在陆地恐龙身上不断进化,直至后来才具备了飞行功能。
The top picture shows similar filaments discovered by Dr McKellar and his team, suggestingflightless dinosaurs sporting such protofeathers were still around in the late Cretaceous.
上图所示为麦凯乐博士及其研究小组发现的类似丝状的羽毛,表明长有这些原生羽毛的非鸟恐龙在白垩纪后期仍然存活着。
Not all the feathers found by DrMcKellar were so primitive, though.
不过,McKellar博士发现的羽毛并不都是远古时代的。
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