In this module, Dr. Hare explores three of his research studies he's done with foxes, New Guinea Singing Dogs, as well as research on wolves. He describes how early dog-wolves may actually be a product of natural selection rather than artificial selection, contrary to popular belief. He introduces a hypothesis called Survival of the Friendliest, which may explain how dogs, bonobos, and modern species evolved in contrast to close relatives, such as wolves and chimpanzees. Last, he relates the high level of social tolerance of these species to human by looking at human self-domestication.