Experts believe that the ability to move only two limbs allowed the dinosaurs to increase their strength and speed.
Scientists say that originally ancient reptiles walked on all four limbs, and then some were switched to bipedal walking.
After these changes, the front paws of the dinosaurs was released, allowing them to catch prey.
If the species was not important the speed of movement, then the dinosaurs evolved again in the direction of travel on four legs.
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