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Postosuchus posture



I am attempting a restoration of Teratosaurus, a close relative of 
Postosuchus. I have located Gregory Paul's reconstruction of the latter 
in 'The Complete Dinosaur' that displays a bipedal stance. Is this in line 
with current thinking, or is a quadrapedal gait, a la 'Walking with 
Dinosaurs', closer to the mark? Postosuchus's head looks too massive and its 
hindlimbs too short to be an obligate biped. Could it have utilized some 
combination, i.e. walking about on four legs but becoming bipedal for bursts 
of speed, as in dispatching prey? 
-Andrew McDonald