Channel 4's new documentary Lucy, the Human Chimp is set to air on Monday night and looks at the life of Lucy, a chimpanzee who was raised as a human in a social experiment back in the 1960s, and her relationship with her main carer, Janis Carter.
MORE: Brooklyn 99 fans spot major plot hint in season eight photo
Lucy was initially raised by psychologists Maurice and Jane Temerlin, where she learned sign language, how to dress herself and to eat with silverware. However, when Lucy became an adolescent chimp and threatened her human family after biting someone, she learned how to live in the wild, where Janis lived with her for several years as she tried to adapt to life.
WATCH: Why Did You Kill Me? on Netflix is your next true-crime watch
Two years after initially leaving Lucy after years helping to adapt in her new home in Gambia, Janis returned to find Lucy's skeleton with no skin or hair, and believed that she had been killed by poachers.
MORE: Viewers left confused by Gogglebox stars' reactions to Prince Philip's death
MORE: Taskmaster: meet the partners of the show's stars
This is the theory that has been widely supported over the years, with author Dale Peterson writing in Visions of Caliban: "Her entire skeleton, minus hands and feet, was found intact at Janis Carter’s old campsite on the island. There was no evidence of injury from a fall, no signs of attack by other animals.
Lucy was raised among humans
"Death by snakebite or a sudden viral illness seemed unlikely; Lucy would have possessed the strength to return to a provisioning area where project workers regularly checked on the apes. Perhaps, it was thought, Lucy had been shot by human intruders."
Next of Kin's Roger Fouts added: "Janis Carter found Lucy’s skeleton by their old campsite. It appeared that Lucy had been shot and skinned by human poachers. Whoever had killed her had cut off her hands and feet. They were probably sold as trophies in one of the African markets that also offer gorilla skulls and elephant feet."
Like this story? Sign up to our newsletter to get other stories like this delivered straight to your inbox.
