英语听力：2013-05-10 完美捕食 Perfect Predators —4

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T-Rex is different. Something about Tyrannosaurs and Tyrannosaurus Rex itself is different than other predatory dinosaurs¹. 

 

But for such a celebrated² killer³ able to take on the toughest creatures of the Cretaceous, some things just don’t add up. It’s slow. With a top speed not much more than 25 kilometers per hour, a T-Rex couldn’t even outrun a fit human. It’s also unwieldy, requiring a full two seconds to make a 45-degree turn. 

 

If a T-Rex were to fall over while chasing a prey⁴ item, it might seriously wound itself. And its hands, with only two fingers are completely useless for gripping prey. 

 

After its giant size and its huge teeth, the thing we most notice about T-Rex are its dinky, little arms, these tiny, little arms that can’t even reach its mouth. 

 

The giant T-Rex is a baffling creature. There has to be more to this killer. How did this giant mouth on legs become the dreaded⁵ butcher of the Cretaceous? Was its raw power, its shark-like jaws⁶, or something else entirely⁷?

 

Fossils of Tyrannosaurus Rex have been unearthed⁸ in the U.S., Canada, and even Asia. For scientists, these discoveries point to one conclusion—this carnivore has little to fear, even from the most well-armed herbivore of the Cretaceous, Triceratops. But to bring down an animal this tough takes more than just brawn⁹, muscle, and teeth. It requires planning and strategy. 

 

The T-Rex is highly intelligent. Its cerebrum is one of the largest of the prehistoric¹⁰ world. It has the ability to process sophisticated sensory¹¹ information.

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