Rats are a small rodent that appears in Wolfenstein games.
Wolfenstein 3D/Spear of Destiny/The Claw of Eisenfaust[]
Dead rats can often be seen near location of a secret room.
Giant Mutant Rats appeared in SNES version of Wolfenstein 3D as the experiments of Dr. Schabbs..
Wolfenstein (Wolf2)[]
Mice, a smaller kind of rodent can be seen in Wolfenstein (Wolf2), as well as Ravens.
MachineGames[]
Rats are sometimes seen scurring away from dark areas.