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In a message dated 97-08-07 14:14:50 EDT, mshelly@noclant.navy.mil (Mark
Shelly) writes:

<< SHAPE:  If bipedal dinosaurs ran fast, an aerodynamic shape would be an
 advantage.  The theropod dinosaurs had this shape.  The main body shape
 was like that of a torpedo or a fish. The body was held nearly parallel to
 the ground as it is in birds with the legs perpendicular to their bodies.
 Overall, their running posture was like that of a skier trying to increase
 his speed.     Mark Shelly >>

On the other hand, an aerodynamic body shape could have been inherited from
flying or gliding ancestral forms...