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Re: Cursorial adaptations (was T.rex and elephants)

>I've always been skeptical of the idea of using the horns for
>intraspecific competition for two main reasons: first, those horns are
>long and sharp.  Aside from the obvious problems of breakage due to
>direct contact with the frill, the risk of injury in such exchanges
>would be quite high.....

How, then, do you explain Pachyrhinosaurus?  I can't see whatever it had on
its snout being much use except in shoving matches.
Ronald I. Orenstein                           Phone: (905) 820-7886
International Wildlife Coalition              Fax/Modem: (905) 569-0116
1825 Shady Creek Court                 
Mississauga, Ontario, Canada L5L 3W2          mailto:ornstn@inforamp.net