Rat


 * Giant rat
 * Pig rat
 * Mole rat

Trivia
On July 13, 2268, as Butch DeLoria and his friends discuss possible names for their gang, Mr. DeLoria suggests "Tunnel Rats" as a cool name for their gang. Wally Mack replies, "Usually, snakes eat rats and lizards." Faced with this response, Butch says never mind and asks his friends for other names.