Re: "why not move on 4 legs" Re: We were never knuckle draggers




Op 06-06-2007 16:06, in artikel
1181138775.933087.72370@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, Lee Olsen
<paleocity@xxxxxxxxxxx> schreef:


Marc Verhaegen wrote:
Op 06-06-2007 06:22, in artikel 4666367C.1C1E045E@xxxxxxxxxxxxxxx, Rich
Travsky <traRvEsky@xxxxxxxxxxxxxxx> schreef:


Yes, that's obvious: knuckle-walking is more derived than bipedalism: in
order to evolve from palm-walking (all primates incL.human infants, except
chimps & gorillas) to knuckle-walking (walking on the dorsal instead of on
the ventral side of the hand), chimps & gorillas needed an intermediary
phase where their hands were +-not used for pronograde locomotion. This
intermediary phase was not arm-hanging (alone): otherwise gibbons & orangs
would knuckle-walk on the ground, but they're palm-walkers. All apes still
walk regularly or occasionally on 2 legs, so the intermediary phase was
(short-legged) bipedalism (probably in combination with climbing arms
overhead).

Marc's explanation of how an obligate biped becomes a quadruped:
"why not move on 4 legs"

Yes, of course. Most mammals except humans & kangaroos move on 4 legs. I
guess there must be a good evolutionary reason for that.

Why don't you answer instead of producing empty blabla, my boy?

Because Doughboy, he is not the one proposing the radical hypothesis.

"he"=??

.

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