The tail of a mouse is nearly hairless, and commonly measures five to ten centimeters in length. The tail is used for balance, and is also used in thermoregulation. Blood flow to the tail can be controlled to respond to changes in ambient temperature. The length of the tail varies according to environmental temperature of the mouse during postnatal development. Mice born in colder climates tend to have shorter tails than their counterparts born in warmer climates.
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