英语听力：2013-04-21 恐龙之战之极限生存 Extreme Survivors—15

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the nest is left unguarded and exposed.

 

Triceratops may be a plant eater, but with a defenseless baby T. Rex around, it'll make an exception. 

 

Quetzalcoatlus is the largest flying carnivore in Earth's history. It eats 4-5 kilos of flesh every day, nearly the weight of two hatchlings combined.

 

To survive, these chicks will have to keep a very low profile.

 

A Tyrannosaurus Rex can pinpoint¹ the exact location of an odor.

 

Soon he's headed straight for the dead Triceratops.

 

The sense of smell was powerful in the T. Rex.

 

The nerve that goes to the sense of smell

 

is the biggest nerve the dinosaur² had.

 

They could probably tell

 

not just if there was dinosaur that had walked past.

 

They could be able to tell

 

that that dinosaur walked past 2 and half hours ago.

 

T. Rex's nose, like a laser-guidance system, and leads him directly to his target.

 

But what these advanced senses do not tell him

 

is how his Triceratops died in the first place. The answer to that question

 

is found in the mouth of another T. Rex.

 

This predator's massive jaws³,

 

with their bone-crushing teeth

 

able to bite down with enough force to bend steel,

 

hold the hidden danger.

 

It's quite likely that the teeth of carnivorous dinosaurs⁴

 

have rotting meat, little bits of it, caught in their teeth, and therefore a lot of bacteria

 

and therefore an infectious bite.

 

The bacteria would have given T. Rex permanent bad breath.

 

There would be many reasons you would not want to be

 

around the mouth of a T. Rex,

 

and smell would have been one of them.

 

That bacteria means that any bite that draws blood

 

can cause a life-threatening infection.

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