It's harder to make the case for crocodilians.

而保护鳄鱼更困难。

Crocodilian bones frequently turn up at such sites.

在这些地区，鳄鱼目动物化石经常被发现。

This has left the topic of what ancient crocodilians ate very much up for grabs.

这就留下了古代鳄鱼吃什么的话题。

Most crocodilians, he reminded people, preferred to dine on fish or molluscs rather than farmers.

他提醒人们，大多数鳄鱼宁愿吃鱼或软体动物而不愿吃农夫。

Nevertheless, this tooth is the first unarguable proof that crocodilians did indeed snack on dinosaurs.

但无可争辩的是，这颗牙是第一个鳄鱼目动物拿恐龙当点心的证据。

Crocodilians, he explained, were much more like birds than snakes.

他解释道，与蛇比起来，鳄鱼明显更像鸟。

On examining these marks more closely, they found a crocodilian tooth stuck in one of them.

在对这些痕迹进一步检查后，他们发现一颗鳄鱼目动物牙齿嵌在其中一块骨头上。

Instead of theropod footmarks, they found those of crocodilians.

他们发现的是鳄鱼的足迹，而不是兽脚类的。

There are 14 different species of crocodiles—not to be confused with other types of crocodilian, like alligators and gharials.

有14种不同种类的鳄鱼——不包含其他类似鳄鱼的鳄目动物，比如短吻鳄和大鳄鱼。

This is the skull of a gharial, an extant persiverous crocodilian.

这是鳄鱼的头骨，一种现存的坚韧不拔的鳄鱼。

He struggled to persuade people who lived alongside crocodilians to see them not as pests, but as friends.

他努力说服与鳄鱼在同一生存环境的人们不把它们看成害虫，而是朋友。

And fossils show that marsupials and ungulates were abundant, as were crocodilians.

化石表明，有袋类动物和有蹄类动物数量众多，鳄鱼也是如此。

They argued that the tracks were  made by a crocodilian, instead.

他们争辩说这些足迹是鳄鱼留下的。

There is also evidence that they had pressure  receptors along the snout, much like crocodilians.

还有证据表明，它们的鼻子上有压力感受器，很像鳄鱼。

The tail also seemed too weak to be used for  propulsion as effectively as a crocodilian does.

尾巴似乎也太弱了，无法像鳄鱼那样有效地用于推进。

But the types of sounds that birds and crocodilians can both make might have popped up in dinosaurs.

但是鸟类和鳄鱼都能发出的声音类型可能已经出现在恐龙身上。

Still more shadowy were the sinister crocodilian outlines—alligators and other uncouth shapes, culminating in the colossal lizard, the iguanodon.

更阴暗的是凶险的鳄鱼轮廓——短吻鳄和其他粗野的形状，最后是巨大的蜥蜴，即禽龙。

This ability to vocalize likely arose independently, multiple times, hundreds of millions of years ago-in frogs, mammals, geckos, and birds and crocodilians.

这种发声能力很可能在数亿年前独立且多次在青蛙、哺乳动物、壁虎、鸟类和鳄鱼身上产生。

In the rivers, there were lungfish, turtles, crocodilians and even aquatic lizards.

在河流中，有肺鱼、海龟、鳄鱼甚至水生蜥蜴。

Many modern crocodilians drag their prey underwater.

许多现代鳄鱼将猎物拖到水下。