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Re: Bird flight once more (was Re: What is a Dinosaur? and semilunate carpal)
First, it would be good to clarify that dorsoventral movement of the
wrist only occurs if the
arm is held outward, level to the horizon.
Imagine a traffic cop waving cars past - this is the movement of the hand I
meant. same orientation of the arm too.
Could a maniraptor direct traffic? :)
That must be a typo - or else this discussion is REALLY attracting some
<The correlation is certainly their, but how does stiff wrists help
Not helping predation [generally], but as I wrote: "a greater predatory
capability in the arms."
This is previously explained as the abscence of a "wobble" in the hands
when the hand strikes the
prey target. If flexible along the transverse axis, this strike would cause
the hand to rebound
from the strike, and reduce penetrating depth of the claws, thus reducing
capability of affirming
But what about movement between the metacarpals and the carpal block - the
distal surface of the semilunate carpal. Could this act as a hinge? How was
this contact strengthemed - or that between individual phalanxes.
I'm thinking all these changes made the arm and hand better for HOLDING prey
but not very good for FEEDING - like using the hand to bring food to the
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