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Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)



Hello,

It should still be able to use the wing claws as hooks (either on bark or branches). Wouldn't it be able to use the tail as a brace as well? Then there's the foot claws (including the second digit to act as crampon). Finally, there is simply running vertically up the tree (possible for short distances as can be seen in arboreal goats).

For the last approach one would think that wing assisted incline running (a la Dial & Bundel) would be very useful. It would seem some mosaic synthesis of the two competing views looks more inevitable every day.

S!

-Jonas Weselake-George


----- Original Message ----- From: "Tim Williams" <twilliams_alpha@hotmail.com>
To: <dinosaur@usc.edu>; <mickey_mortimer111@msn.com>
Sent: Sunday, August 31, 2008 7:47 PM
Subject: RE: Campbell's even crazier than a MANIAC?





Mickey Mortimer wrote:


Because "With the rotation
of the digits and other modifications to the manus, the use of the unguals for grasping in the traditional
sense was lost. That is, the use of the unguals to grasp prey, or vegetation for climbing in the normal
manner, does not work because the unguals now point anteriad, ..."


Silly question.... but how would _Archaeopteryx_ climb trees without using its hands "in the normal manner"? Curiously, a climbing _Archaeopteryx_ has been integral to the idea of a "trees-down" origin of flight for birds, which Campbell (following Martin and Feduccia) are pushing - as opposed to a "ground-up" origin.


(BTW, I'm not necessarily arguing against a "trees-down" origin of flight. However, despite what has sometimes been asserted, "trees-down" is not at odds with "ground-up" [because pro-avians may have exhibited both 'cursorial' and 'arboreal' behaviors to varying degrees], and "trees-down" is entirely compatible with birds being theropod dinosaurs.)




Cheers

Tim
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