有点像最早开始进化的始祖鸟。
这是仅存的一幅始祖鸟画像。
而且，恐爪龙的骨骼结构与始祖鸟很相似。
Moreover, its bone structure was similar to that of Archaeopteryx.
始祖鸟拥有如此奇怪的翅膀一定事出有因。
There must be a reason why Xenicibis had such strange wings.
但是，关于始祖鸟的研究，却一直源源不断。
当更多始祖鸟遗迹被发现时，一切变得甚至有些诡异起来了。
As more complete remains of Xenicibis were discovered, it became even stranger.
根据《自然》上的研究，更突出的是“始祖鸟”也属于同样的一组里。
More strikingly, Archaeopteryxappeared in the same group, according to the study in Nature.
“对于我来说，始祖鸟化石堪称经典案例，”达尔文曾对密友透露说。
尚未已知的是哪类单独的始祖鸟具有攻击性，并且攻击的原因是什么。
What remains unknown is what individual Xenicibis were fighting and why.
尚未已知的是哪类单独的始祖鸟具有攻击性，并且攻击的原因是什么。
What remains unknown is what individual Xenicibis were fighting and why.
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