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I think we can look to the birds (avian dinosaurs) for the answer as they can stand up without the aid of arms. It is simply a matter of getting one's limbs below the center of gravity before extending them. I am not aware of any studies suggesting tyrannosaurs could not do this. Furthermore, tyrannosaurs would have had the additional aid of their tails. From skeletal evidence and albertosaur trackways (in which the tails did not drag), it is clear tyrannosaur tails acted as counter-balances--10,000-pound walking, teeter-totters. The tail would have helped to keep the center of balance back on the body as the hindlimbs were moved into position underneath.

Clearly tyrannosaurs got up at least once during their lives (at birth) and there is no reason to believe they could not throughout life--armed with pathetic arms or not.

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15y ago

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