This has caused some confusion: for example, the early plant-eating prosauropod Plateosaurus was traditionally depicted as quadrupedal, only for a recent anatomical study of its forelimbs to demonstrate that four-legged walking was impossible, since the palms of its 'hands' could not rotate far enough to face the ground.ДЄs for those that definitely walked on four legs - including large sauropods such as Apatosaurus (formerly known as Brontosaurus) and Diplodocus - one explanation for their posture is the large 'fermenting' stomach they needed to digest tough plant material. rex - semi-quadrupedal and quadrupedal herbivores began to emerge in the Early Jurassic epoch. While carnivorous dinosaurs (theropods) remained bipedal throughout their evolution - with smaller grasping forelimbs as epitomised by T. So it has been deduced that bipedal dinosaurs possessed more stamina and could run for longer than many of today's reptiles. By contrast, lizards and crocodiles find it hard to breathe and run at the same time because their body undulates from side to side, meaning air has to be shunted between their lungs. This, and the fact they walked on their toes with a relatively long stride, would have allowed them to move faster and further without stopping. T he earliest dinosaurs were all bipeds, walking on two legs that moved directly forwards and backwards under their bodies (akin to birds and mammals) rather than sprawling out to the sides like lizards and crocodiles.

Walking with dinosaurs stegosaurus