Mole rats are mutated rodents that are much larger than their pre-War cousins. They have survived as a species by burrowing underground where the soil protected them from direct nuclear explosions. However, they still were greatly mutated by the subsequent fallout, increasing their size as well as their viciousness. A few people in the wastes have even been known to train them and keep them as pets.
Mole rats are usually found in packs of roughly three to four, but are occasionally in pairs, or by themselves. They are often witnessed standing on their hind legs and sniffing the air, allowing them to smell any predators that may be coming. They occasionally scratch at the ground, attempting to dig a burrow.
Mole rats are very aggressive, but may retreat if severely outmatched. They fight for their food by biting at prey with their large incisors. When attacking, mole rats charge towards their opponents and have a long melee range, with the ability to lunge several feet.
Mole rats are usually hostile unless the Lone Wanderer has the Animal Friend perk, and they will help the Lone Wanderer in battle if he/she has the second rank of the Animal Friend perk.
When hit by the repellent stick, a mole rat's head will explode in approximately three seconds, regardless of where the hit is made on its body. This stick is incredibly effective against mole rats, killing them in two hits.
Several mole rat decorations can be found throughout the wasteland. For example, the mole rat skin rug that can be found on the Duchess Gambit.