Posted on 11/15/2010 2:37:19 PM PST by decimon
Tyrannosaurus rex was far from a plodding Cretaceous era scavenger whose long tail only served to counterbalance the up-front weight of its freakishly big head
Tyrannosaurus rex was far from a plodding Cretaceous era scavenger whose long tail only served to counterbalance the up-front weight of its freakishly big head.
T. rex's athleticism (and its rear end) has been given a makeover by University of Alberta graduate student Scott Persons. His extensive research shows that powerful tail muscles made the giant carnivore one of the fastest moving hunters of its time.
As Persons says, "contrary to earlier theories, T. rex had more than just junk in its trunk."
The U of A paleontology student began his research by comparing the tails of modern-day reptiles like crocodiles and Komodo dragons to T.rex's tail. Persons found for that all animals in his study, the biggest muscles in the tail are attached to upper leg bones. These caudofemoralis muscles provide the power stroke allowing fast forward movement.
But Persons found T.rex had one crucial difference in its tail structure.
The tails of both T.rex and modern animals are given their shape and strength by rib bones attached to the vertebrae. Persons found that the ribs in the tail of T. rex are located much higher on the tail. That leaves much more room along the lower end of the tail for the caudofemoralis muscles to bulk-up and expand. Without rib bones to limit the size of the caudofemoralis muscles, they became a robust power-plant enabling T.rex to run.
Persons extensive measurements of T.rex bones and computer modeling shows previous estimates of the muscle mass in the dinosaur's tall were underestimated by as much as 45 per cent.
That led many earlier T. rex researchers to believe the animal lacked the necessary muscle mass for running which in turn limited its hunting skills. That lack of speed cast T. rex in the role of a scavenger only able to survive by feeding on animals killed by other predators.
As for an T. rex's exact speed, researchers say that is hard to measure, but Persons says it could likely run down any other animal in its ecosystem.
###
Persons' research was published in the journal The Anatomical Record.
To arrange an interview with Persons please contact Brian Murphy.
Tail draggster ping.
So T-Rex would have been a great tennis player.
This would mean T-Rex’s massive tail rarely touched the ground. Never when he was moving.
Wasn’t Bob Bakker all over this in the late 80’s?
What’s this nonsense that T-Rex died out 64 million years ago? I saw a movie of one romping around with Raquel Welch back in 1Million B.C.
How would you like to see that leaping the net towards you?
I’m still waiting for someone to get it. Sometimes I think my jokes are too obtuse.
no ... acute ...
I would think that a TRex would get around much like a kangaroo.
Shirley Knott. Obscure, maybe.
Tons of hop.
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And with a tail to tell?
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You tryin' to start a riot???
“Hey, nothing’s over until *we* say it is. Was it over when the Germans bombed Pearl Harbor? ... Marmalard? Dead! Neidermeyer?
“Dead! Bluto’s right. Psychotic, but right.”
I wonder how this whole tail discovery fits with T-Rex mating (speaking of tails to tell).
No, not to speed or hunting, but to it's balance. Sheesh.
I should have been a paleontologist.
5.56mm
So scary that he'd turn tail and run.
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