The docile, calm and floppy nature of the Ragdoll is a characteristic thought to be passed down from the Persian and Birman breed. Opinions vary as to whether this trait might be the result of genetic mutation. The extreme docility of some individuals has led to the myth that Ragdolls are pain-resistant. Some breeders in Britain have tried to breed away from the limpness due to concerns that extreme docility "might not be in the best interests of the cat". On multiple occasions, ragdolls have been reported as nonchalantly approaching moving cars and vicious dogs and getting hurt. Breed standards describe the Ragdoll as affectionate, intelligent, relaxed in temperament, gentle, and easy to handle lap cat.