Evolution perfects not only Parasaurolophus' ability to make sounds.

进化不仅使副栉龙在发声能力上趋近完美。

And Parasaurolophus' crest becomes more advanced and their communication skills better and better.

副栉龙的头冠更加发达，沟通技巧也越加娴熟。

For Parasaurolophus, genetic modifications over time give them the tools both to pick up and emit these low-frequency sounds.

对副栉龙来说，长期的基因变化使它们拥有了学习和模仿这些低频声音的工具。

Parasaurolophus and Sauroposeidon rely on the numbers to spot predators before they attack.

副栉龙和波塞东龙靠群居来警惕食肉动物的攻击。

When you've got multiple Parasaurolophus living together, that means multiple eyes to scan the horizon.

当有许多副栉龙群居在一起时，意味着许多双眼睛扫视周围。

Parasaurolophus' general resonant frequency as low as 40 hertz, a sound almost as deep as a foghorn.

副栉龙的共振频率一般低达40赫兹，这种声音几乎和雾角一样低了。

These calls are Parasaurolophus' primary form of defense.

这些声音就是副栉龙最主要的防御手段。

But for a Parasaurolophus, these calls can be used for more than just communication.

但对副栉龙来说，这种声音不仅用来交流。

An isolated Parasaurolophus would be a dinosaur in trouble.

一旦落单，副栉龙就很可能有危险。

And Parasaurolophus has a single, elongate crest.

副栉龙有一个单一的、细长的冠。

Parasaurolophus, with a call so powerful, it's a dangerous weapon.

副栉龙能发出极具破坏力的响亮声音。

Parasaurolophus has the biggest brain of all herbivores.

副栉龙有食草动物中最大的大脑。

Lambeosaurus, Corythosaurus, and Parasaurolophus are three Hadrosaurus from the Dinosaur Park Formation of Alberta.

Lambeosaurus、Corythosaurus 和 Parasaurolophus 是艾伯塔省恐龙公园组的三只鸭嘴龙。

For a Parasaurolophus, the traits that make survival in a savage world possible very soon become the very same traits that attract a mate.

对于副栉龙来说，这种在野蛮世界中存活的特质可能很快成为了吸引配偶的完全相同的特质。

Parasaurolophus range across a vast area - more than 160,000 square miles from Alberta, Canada, to New Mexico, a region with more than its fair share of vicious predators.

副栉龙种群分布广泛——超过十六万平方英里，从加拿大的阿尔伯达到美国的新墨西哥，比恶毒的捕食者要广得多。

What was a surprise is the higher centers of their brain are very large and suggest that something very different is going on in Parasaurolophus and its kin than in most other of these plant-eating dinosaurs.

令人惊奇的是大脑的高级中心非常巨大，这意味着副栉龙和它的亲缘物种一定有一些非常独特的，与其它食草恐龙些与众不同的地方。