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Over half of the living families of rodents appeared by the end of the Oligacene. The miocene spread of grasslands or savannas in both the old world and the new world provided new adaptive zones for rodents. The evolution of jerboas (Dipodidae) in the old world and the kangaroo rats and pocket mice (Heteromyidae) in the new world What is probably decisively affected by increasing aridity in the late miocene and the appearance of deserts in the pliocene.
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