Naked mole-rat. A eusocial rodent that lives in large tunnel systems in the arid regions of East Africa. Colonies number from several dozen to several hundred individuals, with a single breeding queen and division of roles such as soldiers and workers. Body length about 8–9 cm, weight 30–80 g; vision is poor and individuals rely on sensory hairs and smell. They feed mainly on underground plant roots and tubers, and are known for unique physiological traits such as longevity and cancer resistance. Conservation status: Least Concern.