The Mutated pig rats are much tougher than standard ones. They have a lot of Action Points. A low-level character should be on caution.
- Redding: Outside the Great Wanamingo Mine.
- Modoc: Some of the mole rats in Farrel's garden are the mutated variant.
- Mariposa Military Base: On levels 1 and 3. Mechlior spawns them in level 4, if the players gives him time.
- On random encounters.
Mutated pig rats appear only in Fallout 2.