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Mangy rad-rat is a creature in Nuka-World.
These over-sized rodents are the result of ambient radiation mutating common rats. Having grown larger from their mutations, rad-rats have the aggressiveness that goes with it. Instead of scurrying away from anything larger than them, rad-rats attack with reckless abandon. They live in small nests, so when one rat attacks, they all attack, biting with their chisel-like incisors.
Mangy rad-rat appears in Nuka-World.