Gerbilling, also known as gerbil stuffing or gerbil shooting, is an urban legend description of a fictitious sexual practice of inserting small live animals (usually gerbils but also mice, hamsters, rats and various other rodents) into one's rectum to obtain stimulation. Some variations of reports suggest that the rodent be covered in a psychoactive substance such as heroin prior to being inserted. There is no evidence that the practice has ever occurred in real life, and its existence remains highly dubious, as all rodents have long nails and teeth for digging or burrowing and naturally try to burrow out of any small spaces.