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Re: Giganotosaurus Arms Vs. T-Rex Arms
T. rex arms were around the same LENGTH as an adult human .There the size
similarity ends.The bulk makes the difference . I've not seen any
Giganotosaurus does have smaller arms , bulk wise.
references that would indicate that Giganotosaurus had "beefy" arms . T.rex,
on the other hand (no pun intended) ,supposedly could heft about 400 lbs
with one arm .<<<
You know, I can't tell you how often I run into this misperception.
Yes, T.rex could probably curl around 400 lbs. I'm hardly a trained
athlete, and I can curl at least 40 lbs. That's 1/4 my body weight. By the
same token an animal the size of a T. rex should be able to curl at least a
ton. "Oh, but the arms are incredibly massive for their size!" could be the
response, but I'm not sure what use that is without taking body mass into
account. After all, Mononykus' forearms are far more robust (and apparently
better muscled, looking at the biceps tubercle, not to mentionthe olecranon
from which it derives its species name) for "their size" than a
tyrannosaur's, but there is little popular mention of it.
The reason I mention all this is because some of the muscles associated
with the forearm, especially the latisimus dorsi and the pectoralis, also
make importqant contributions to the structural integrity of the rib cage.
So T. rex didn't neccessarily have strong arms because they were used for
anything, but rather some of the muscle attachments appear large becaue
those muscles are still important to a 6 ton animal.
As for Giganotosaurus, according to Nate Murphy, who worked on the
excavations with Phil Currie has mentioned that they are more robust than a
tyrannosaurs. I can't confirm or deny that statement. Sorry.
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