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Re: JP and Falling T-Rex (Take 3?)
From: Mark Sumner <email@example.com>
> We've rehashed the "falling T. rex" on this list quite extensively,
> ... Perhaps they -simply didn't fall-. It would be quite easy to
> demonstrate that the rock climbing life style of mountain goats is
> unlikely, as a single slip would result in their crashing to their
> death. But the goats persist in clinging to their perches.
Indeed. This is a good point.
I saw a dramatic demonstration of a goat's rock-climbing ability
the other weekend when I went to the San Diego zoo.
The enclosure for one of the smaller ?Asian? goats had decorative
bas-relief fake stones in its wall. These produced a "ledge" of about
an inch depth.
Yet the goat *jumped* some five feet up and landed four-footed on
this minute ledge, and stood there for a few moments, looking up at
the fence above.
> Falls by a T. rex might have caused injury, but they might have
> been such rare events that the need for greater speed outweighed
> any threat of rare falls.
Another good point - natural selection is great at making fine level
cost-benefit trade-offs. As long as the benefit of the speed exceeds
the *net* cost, evolution *will* favor it.
> T. rex was a predator, and it had to catch its prey. Unless you
> are ready to bog the whole Creatceous in an endothermic slow dance,
> I seriously doubt that T. rex would have any trouble outpacing
> such a poky creature as a human being.
Espacially at that size. It is not as if it would have to "run" very
*far* to catch one of us little folk. A couple of steps would probably
Of course the question of whether a T.rex would even *bother* with
trying to catch such a small mouthful as a human becomes relevent
here. [How often do wolves eat mice?]
The peace of God be with you.