Lagomorphs and rodents
Although they are distantly related if at all, the rabbits, hares and picas on the one hand and the squirrels, rats and cavies on the other resemble each other both anatomically and in their life styles. All are gnawing vegetarians often equally at home above or below ground or in the water. Moreover in the rodents there is a very large number of species, for they are one of the few mammalian orders that is at or near its peak and has not yet passed into decline. More than half of the living mammals are rodents.
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