But this all changed when Bruno, another hadrosaur of the same species was discovered.

但相同物种的另一只鸭嘴恐龙被发掘后，这一切都改变了。

Take for example, the footprints of hadrosaurs.

以鸭嘴龙的足迹为例。

Back in 1994, in Trieste, a municipality in North Eastern Italy, scientists discovered Antonio - a small hadrosaur, or duck-billed dinosaur.

回到1994年，在意大利东北部城市的里雅斯特，科学家们发现了“安东尼奥”——一只小型鸭嘴恐龙。

That was when paleontologists studied the trackways of hadrosaurs.

那是古生物学家研究鸭嘴龙足迹的时候。

Has described the differences in scale patterns between two closely related species of hadrosaurs.

描述了两种密切相关的鸭嘴龙物种之间的鳞片模式差异。

The hadrosaur Edmontosaurus got dramatically larger with age and so did Camarasaurus, an herbivore that lived in the Jurassic Period.

随着年龄的增长， 鸭嘴龙埃德蒙顿龙变得越来越大，生活在侏罗纪时期的食草动物圆顶龙也是如此。

I have here one-half of the lower jaw of a hadrosaur.

我这里有一只鸭嘴龙下颚的二分之一。

Three of the hadrosaurs have a crest, but one doesn't.

三只鸭嘴龙有纹章，但一只没有。

Here, we have a complete hadrosaur tooth.

在这里，我们有一颗完整的鸭嘴龙牙齿。

But in a marathon, the slower, but steadier hadrosaur would win the race.

但在马拉松比赛中，速度较慢但更稳定的鸭嘴龙将赢得比赛。

If you remember, I mentioned earlier, that the old view of hadrosaurs had them standing almost upright, on their hind limbs.

如果你还记得的话，我之前提到过，鸭嘴龙的旧观点认为它们几乎直立，用后肢站立。

This is a cross section of a hadrosaur jaw.

这是鸭嘴龙下颚的横截面。

The ankylosaur, euplocephalus, ceratopsian, triceratops, and all of the hadrosaurs have a predentary bone.

甲龙、真头龙、角龙、三角龙和所有的鸭嘴龙都有一块掠食骨。

The Iguanodon had a characteristic spiky thumb whereas the hadrosaurs basically had a hand that was encased in a mitten of skin.

禽龙有一个特有的尖刺拇指，而鸭嘴龙基本上有一只手被包裹在皮肤连指手套中。

Hadrosaurs were plant-eating dinosaurs that had to grind up tough plants rather than soft meat.

鸭嘴龙是一种以植物为食的恐龙，它们必须磨碎坚硬的植物而不是软肉。

So, in a sprint, a tyrannosaur would definitely outpace a hadrosaur.

因此，在短跑中，霸王龙肯定会超过鸭嘴龙。

Although hadrosaurs and ceratopsians both have dental batteries for grinding up plants, they were doing similar things in slightly different ways.

尽管鸭嘴龙和角龙类都有用来磨碎植物的牙科电池，但它们以略有不同的方式做着类似的事情。

But in all three skulls, the crest is formed from the same bones and the crest is hollow, which is characteristics of lambeosaur and hadrosaurs.

但在所有三个头骨中，嵴是由相同的骨头形成的，而且嵴是空心的，这是鸭嘴龙和鸭嘴龙的特征。

Let's take a moment to compare the jaws of mammalian herbivores with the hadrosaur jaw.

让我们花点时间比较一下食草哺乳动物的下颚与鸭嘴龙的下颚。

So we can draw a circle around the crested hadrosaurs.

所以我们可以在冠冕鸭嘴龙周围画一个圆圈。