Rat (Fallout)

Background
These creatures can range from standard disease-ridden wharf rats to the somewhat larger - and hungrier - mutant Chihuahua-sized rats. Having survived the atomic bombs of the Great War, they continue to multiply as they had prior. After the Great War, people still regard them as vermin but also serve as a food source. All rats travel in packs, but they're seldom dangerous.

Biology
The common rat hasn't been noticeably affected by the high levels of background radiation, unlike most creatures of the wasteland. They slightly range in sizes and are known to gnaw through everything from electrical cords to heel tendons.

Gameplay attributes
The rats are by far the weakest enemy the player character can encounter in their travels. Rats travel and live in large packs, and are usually encountered in large groups with mole rats or pig rats.

Rat
Rats are very diminutive rodents who pose only an incredibly minor threat to the player character. They're small, fast, and they've got a mean streak.

Cave rat
Cave rats are very diminutive rodents who pose only an incredibly minor threat to the player character, found only in caves. They're small, they're fast, and they've got a mean streak.

Tough rat
Tough rats are very diminutive rodents who pose a slightly harder difficulty compared to their lower variants.

Radiated rat
Radiated rats are irradiated rodents who pose a slightly harder difficulty compared to their lower variants.

Mutated rat
Mutated rats are mutated rodents who pose the hardest difficulty compared to their other variants, aside from the tough radiated rat.

Appearances
Rats appear only in Fallout and Fallout 2.