Lizard

The  is a type of animal. This animal is a cold-blooded, long-bodied reptile with four legs and a tapering tail. Lizards include iguana. This is a prey animal for snakes. Vault residents know of this animal from the books supplied by Vault-Tec to the Vaults.

On July 13, 2268, when Butch DeLoria is considering the name "Vault Rats" for their gang, Wally Mack says, "Usually, snakes eat rats and lizards." Confronted with this, Mr. DeLoria responds with never mind and asks his friends for other possible names.