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The tuatara are a powerful reptilian race, and their methods of battle are savage beyond compare.
A negative relationship between body size and rate of molecular evolution was found for phylogenetically independent pairs of reptile species spanning turtles, lizards, snakes, crocodile, and tuatara .
Finally, today's snakes, lizards, turtles, the tuatara , and crocodiles do enjoy a surprisingly broad latitudinal distribution.
New Zealand's tuataras were in a group of their own, and seem not to have changed at all.
At some point, the researchers do not know exactly when, an unknown factor allowed lizards and snakes to rise to dominance in South America, relegating the sphenodontids to the relic tuataras in isolated New Zealand.