Most vole species have rootless molars that fold into a series of
triangles.Voles exhibit complex genetic structures with much variation, and appear to
be evolving rapidly when compared to other vertebrates. Species have been
found with anywhere from 17-64 chromosomes. Female voles have been found with
chromosomes from both sexes. All of these variations result in very little
physical aberration: most vole species are virtually indistinguishable. Adult
voles, depending on the species, are three to seven inches tall.
The prairie vole, Microtus ochrogaster, is an important animal model for
sexual fidelity, since the male is completely faithful to the female. A closely
related species, the meadow vole, has promiscuously mating males, and
scientists have changed meadow voles' behavior to resemble that of prairie voles via
experiments in which a single gene was spliced.
--Vole, Wikipedia
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