所有这些羽毛类型在兽脚亚目的印痕化石中都被找到了，兽脚类属于恐龙亚目，包括了雷克斯霸王龙、鸟类以及其他手盗龙。

All these feather types have been found in fossil impressions of theropods, the dinosaur suborder that includes Tyrannosaurus rex as well as birds and other Maniraptorans.

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从二十世纪七十年代开始，在古生物学圈中，关于鸟类是否是就是由一种被称作兽脚亚目的双脚恐龙群组进化而来的争论一直喋喋不休。

Starting in the 1970s, a growing number of paleontologists argued that birds had evolved from a two-legged group of dinosaurs called theropods.

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