The Rats are all identical in appearance, apart from size. They all have grey fur and bulging, blue eyes with yellow scleras. The Rats live together in a mischief of rats. They operate as a collective group under the leadership of the Giant Rat, the biggest of the mischief who makes all of the rules. Once a Giant Rat dies, another rat has the chance to spontaneously grow to be the next Giant Rat and assume leadership of the group.