Fossorial

Fossorial animals live underground and for a variety of reasons: amongst others to feed on soil flora and fauna, to avoid predators, or to hide away from the extremes of climate that exist above ground. So, a British mole avoids the worst of the winter cold in its tunnels, whilst a naked mole rat in Africa gets protection from the heat. And both have some protection from roaming predators.

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About

A fossorial organism is one that is adapted to digging and life underground such as the badger, the naked mole rat, and the mole salamanders Ambystomatidae. It is an adjective most commonly used as to describe the habit of living underground, even if the physical adaptations are minimal - thus, most bees and many wasps are called "fossorial Hymenoptera", and a great many rodents are considered fossorial. Some organisms are fossorial to aid in temperature regulation, while others utilize the underground habitat for protection from predators or food.

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