The Truth About Killer Dinosaurs Page #2

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powerful bites of any living animal.

They're also among T rex, s

closest living relatives.

Paleontologist, Greg Erikson calculates that, if

he can measure the force of an alligator's bite,

that measurement could be scaled up

to get the force of a T rex bite.

So, Greg hitches a ride

with the Florida Alligator Control

who are hoping to catch a rogue, gator

that has been making a meal of the local dogs.

Crikey, she's a fine one!

Greg's caught a whopping 12ft animal,

weighing around 450 lbs -

that's the same weight as 3 men.

This wild rogue alligator is the perfect subject

for Greg's bite test.

All he has to do is insert the biteometer

where it counts.

Actuality- bite test, 2,209 bite... 1 Ton.

So now Greg can scale up

that one ton measurement to work out

how strong the bite of a T rex would be.

We're close to release, everyone ready?

After 3 months of painstaking engineering

and careful scientific calculations,

the bio-mechanical T rex head is ready to test.

Based on his work with alligators,

Greg has calculated that T rex would have

had a bite force of at least 4 tons.

The bone would've had to been so strong that

the only way to replicate it is by using steel.

And the enormous muscle power

is provided by a hydraulic piston.

It's time to test true strength of the jaws....

This is just part of a cow's leg bone.

T rex had the strongest bite

of any animal ever known.

Eight times more powerful than a lion.

Four tons of brute force

completely pulverises the bone.

This dinosaur could certainly

have delivered a killer bite.

The bio-mechanical bite test doesn't prove

that T rex really did attack Triceratops.

But amazingly, the fossil evidence does exist...

John Happ has some more fragments from a

Triceratops, this time dug up in Montana, USA.

First a fossil of a damaged horn...

When we first

found the left brow horn we were disappointed

because about a 1/3 of the horn is missing.

These are bite marks....

... the end of the horn was bitten off.

The shape of the teeth marks proves once again

that the culprit could only be T. Rex

Bite marks alone

still don't prove T. Rex attacked Triceratops.

But John has noticed something else.

We found some additional bite marks.

A line made where T. Rex's tooth

raked into the frill.

But there is something strange about this line.

Where you might expect a clean-cut groove

from the tooth - there is an unusual ridge.

And when John x-rays the ridge

the incredible truth is revealed.

You can see at the first score

mark an area of dense bone.

This is an indication that the bone re-healed.

The bone re-healing is the crucial evidence.

It proves that Triceratops was attacked

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