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Physiologically, pair-bonding behavior has been shown to be connected to vasopressin, dopamine, and oxytocin levels, with the genetic influence apparently arising via the number of receptors for these substances in the brain; the pair-bonding behavior has also been shown in experiments to be strongly modifiable by administering some of these substances directly. Additionally, genetic material typically found on the Y chromosome has been found in both males and females in at least one species.In another species, the X chromosome contains 20% of the genome.

When the oxytocin receptors were blocked this behavior stopped.

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As many as 88% of voles are estimated to die within the first month of life.

The prairie vole is a notable animal model for its monogamous sexual fidelity, since the male is usually faithful to the female, and shares in the raising of pups. Another species from the same genus, the meadow vole, has promiscuously mating males, and scientists have changed adult male meadow voles' behavior to resemble that of prairie voles in experiments in which a single gene was introduced into the brain by a virus.

Brandt’s vole (Lasiopodomys brandtii) lives in groups that mainly consist of close relatives. The mating system of these voles involves a type of polygyny for males and extra-group polyandry for females.

This system increases the frequency of mating among distantly related individuals, and is achieved mainly by dispersal that occurs primarily during the mating season.

All of these variations result in very little physical aberration; most vole species are virtually indistinguishable.

Among those matings that do involve inbreeding, the number of weaned juveniles in litters is significantly fewer than that from noninbred litters, indicating inbreeding depression.

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A vole is a small rodent; a relative of the mouse, the vole has a stouter body, a shorter, hairy tail, a slightly rounder head, smaller ears and eyes, and differently formed molars (high-crowned and with angular cusps instead of low-crowned and with rounded cusps). They are sometimes known as meadow mice or field mice in North America and Australia.

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