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Re: 'MAMMALS MAKE LOUSY REPTILES'
> ON THE PRESSURE EXERTED ONTO FORELIMBS when a rearing sauropod moved
back to it s
> quadrupedal state, I feel it unlikely that much exertion of the
> have been needed. To rear into a bi/tripodal stance, a big dinosaur
> probably not need to 'push off the ground' with its forelimbs.
Simply leaning > back would tilt the sacrum, the counterbalancing of
the tail immediately liftin g
> the thorax and neck. Lizards that rear in threat displays 'push up'
with the > arms, but their tails aren't far enough off the ground to
provide a levering > effect for the upper body.
=How does it "lean back" without using its forelimbs? It seems to me
=like to only way to shift the animals balance backward would be to
=push off with the forelimbs. If it isn't using these, exactly what
=is it flexing or tilting or whatever to shift the center of gravity?
elephants (to use a sample that is viewable today) first bend their
knees (yes, on the back legs), then sit back on their haunches, and
then lift their front legs off the ground to rear up. The lack of a
push-back by the front legs is probably because the front legs are
pretty straight and wouldn't give much vertical lift if flexed.