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Re: Incredibly preliminary size estimate for new T. rex



> Elephants are not theropods, but perhaps medium sized sauropods.  
> They can run fairly fast.  They do not fall often(hardly at all) and 
> when they do fall they often hurt themselves.  They just don't fall 
> often.  Perhaps this is because they are quadripedal, etc.

    Probably.  And also, they would not need to run as aften as a
predator which also reduces thier chances of falling significantly.  In
other words, T.rex is running more often and a biped and so at greater
risk of falling; and as you noted, an elephant sized animal WILL hurt
itself if it falls, even if it doen't die.
     Whether or not Dr. Farlow's numbers are dead on, the illustrate well
that the force of impact of a falling animal increase IMMENSELY with
increasing mass.  

> A well placed strike at long bones requires little energy 
> to break in humans.  But there is soft tissue and connective tissue 
> involved. So injury in falling would involve a lot of complex 
> variables not addressed with pure physics.  

     Physics can tell us the forces involved with a given mass hitting the
ground; and it can also give us some idea as to the tensile and impact
withstanding abilities of tissues.
      Yes, T.rex was likely a to a large degree a RUNNING PREDATOR for
reasons that have already been discussed on this list.  However, the
dangers posed to it as a running bipedal predator of its size were
probably very significant.

LN Jeff
O-