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Re: semilunate carpal
Tom Hopp wrote:
[snip] The animals seemed to me to
Having seen the Velociraptor vs Protoceratops fossil (somewhere - maybe at
Dinofest 98?) I'll chime in. The velociraptor was pushing away. I got the
distinct impresson the Velociraptor was in trouble, the fatal variety.
have bled to death simultaneously, with a sand storm raging around them.
The two were locked in a fight to the death. But I'd bet pounds to peanuts
that _Velociraptor_ started it.
PS I'm not a big fan of the "predatory stroke" hypothesis, having read all
Ostrom's papers (he started the concept and now disavows it).
I thought Ostrom's hypothesis was rather different: The feathered forelimbs
were used as insect nets to bat insect prey toward the mouth. This doesn't
constitute a predatory stroke in the sense that it was proposed by Gauthier,
Padian and others. Under the latter model, the arms swing forward and
downward and the hands actually grasp the prey. The feathers play no direct
role in prey acquisition.
As others have
said, if manipulating prey by hand is important, why limit the hand's
to adopt various angles and flexions? There is a much more cogent reason
making a rigid wrist, as I have mentioned before . . .
Yeah, but as I said, manipulation of prey was *not* important. The hands
clamped onto the prey and held it tight as the jaws and feet were put to
work to subdue the prey (suffocation with the jaws, evisceration or blood
loss courtesy of the slashing claws). The _Velociraptor_ and
_Protoceratops_ death-struggle is a case in point. The prey is of
comparable size to the predator - no manipulation of the prey is necessary.
What would be the point of having a hand capable of "various angles and
flexions"? The predator just uses its hands to lock on to the prey, the
jaws and teeth did the rest.
Timothy J. Williams
Iowa State University
Ames IA 50014
Phone: 515 294 9233
Fax: 515 294 3163
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