But many theropod dinosaurs have ambiguous features , such as peg-like teeth at the front of the mouth , or no teeth at all .

但是，许多食肉恐龙的特征并不是很明显，例如：要么在嘴的前部有“钉状牙齿”，要么就根本没有牙齿。

An example of macroevolution is the appearance of feathers during the evolution of birds from theropod dinosaurs .

宏进化的一个例子是鸟类在从兽角亚目的恐龙进化期间羽毛的出现。

The functional morphology of theropod dinosaurs and the early evolution of the avian wing .

兽脚类恐龙功能性型态学与鸟类翅膀早期发展。

Paleontologists are now carefully studying the closest theropod relatives of birds for clues to how this transition occurred .

古生物学家正在对鸟类的兽脚亚目最近亲进行仔细研究，以寻找这种转化的线索。

Many ' theropod ' dinosaurs , those with bird-like features which walked on two legs and often had feathers , preferred to eat leaves and grass .

许多食肉恐龙带有鸟类特征：可于陆地上行走，通常都长有羽毛，这类恐龙更喜食树叶和草。