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The thermoregulation system in animals removes body heat in hot temperaturesand retains body heat in cold temperatures. The better the animal removes heat,the worse the animal retains heat and visa versa. It is the balance betweenthese two conflicting goals that determines the mammal's size, heart rate andamount of hair. The rat's loss of tail hair and human's loss of its body hairare responses to these conflicting thermoregulation needs as these animalsevolved to larger size over time.

Thermoregulation in mice, rats and humans: An insight into the evolution of human hairlessness