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The comparisons of the three species showed that when a squirrel gnaws, its biomedical processes are more favorable than with a gnawing guinea pig. But this grass eater chews more ergonomically with his molars than the tree dweller with preference for hard nuts. But the rat puts both in the shade, showed the computer models: An optimized jaw musculature, skull shape and perfect motion sequences make the masticatory apparatus of the rat in both functions the winner. "That's like when a multi-fighter beats two sprint specialists on the short haul, " says Jeffery.
As the evolutionary evolutionary lines of rodents separated millions of years ago, the ancestors of squirrels and guinea pigs have specialized in their diet, explain the researchers. In the evolutionary history of rodents from the rat and mouse group, evolution has fiddled with an all-round dentition? and finally the absolute winner of the test produced. Probably that was an important aspect of the success of this rodent suborder, the scientists say: The Myomorpha, with more than 1, 600 species, represent more than a quarter of all mammalian species today. displayNathan Jeffery (University of Liverpool) et al .: PLoS ONE, doi: 10.1371 / journal.pone.0036299 © science.de? Martin Vieweg