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


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.
Since you are, the burden is on you to supply the proof for it.

Jason "You are asking someone to prove a negative. This isn't science,
though I suspect you don't know what science is and as such will
continue your mentally ill diatribes."

.

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