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In a message dated 95-09-15 19:43:46 EDT, martz@holly.ColoState.EDU (Jeffrey
Martz) writes:

>     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?

Sauropods probably reared up on their hind limbs by planting their hind feet
and flexing the caudifemoral retractors to pull the tail down, closer to the
femora. This would have levered the back and forequarters around the
acetabulum into an upright stance.