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Like a miniature tyrannosaur, the collared lizard hunts on two legs. It runs at an angle with its front legs lifted off the ground. But this lizard is more agile than any dinosaur and, size for size, it's much faster. Being smaller it gains in both speed and manoeuvrability. Most bipedal lizards live in deserts as this kind of running needs space. When hunting other lizards, two legs give it the edge.