Re: An alternative to ST and AAT
9 Dec 1996 19:42:02 GMT

In article <>,
(Paul Crowley) writes:

>In the first form of locomotion its trunk is horizontal; in
>the second it's vertical. It cannot have a trunk at 45 degrees
>or at angles other than ~0 or ~90 degrees. It cannot move
>gradually from one to the other. So at the initial stage
>we have to have a quadrupedal animal adopting a bipedal stance
>-- as we see with chimps. The only way it can progress is
>to adopt this stance more and more often, going from 10% of
>locomotion time to 20% to 30% and so on. As it does this,
>it will get better and (over generations) adapt. Its spine
>will adapt to the vertical posture; its pelvis will re-
>orientate; its legs will get straighter and its knees will
>develop locking mechanisms. But each of these changes will
>reduce its ability to progress quadrupedally.

Hello Lamark!