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Re: Herbivore protection



Rob J. Meyerson notes that there must have been some (as yet unknown) system
of hadrosaur defense because against the tyrannosaur they would have
experienced "... a practical 100% kill rate..." , but that "Since this group
was very successful, there had to have been some method of eluding
predators...".

Is it possible that the Tyrannosaurs (forgive the pluralization, please ;-))
simply weren't as populous (sp?) as necessary to wipe out the hadrosaurs?
 After all, there is much more evidence of hadrosaurs in the fossil record
than of tyrannosaurs.  While this is admittedly negative evidence, and
therefore less reliable, it seems it fits the circumstance.

Perhaps the tyrannosaurs were wide-ranging loners, their numbers kept in
check by, among other things, intra-specific competition.  Other, less
devastating predators may have kept the hadrosaur population in check,
without obliterating them.

Just a few thoughts.  Fire when ready!

Wayne A. Bottlick