John Bishop ventures into the forests of Rwanda and joins the Gorilla Doctors, a group of vets who have dedicated their lives to saving the 880 mountain gorillas left in the wild. The vets trek for hours every day to monitor the health of each gorilla and treat them at the first sign of illness or injury. It’s difficult, dangerous work as John witnesses first-hand, but also very rewarding. Thanks to their efforts, the gorilla numbers are increasing, but only through constant vigilance and a concerted conservation effort. Bishop also discovers that the adolescent male mountain gorillas are not unlike his teenage sons – muscly with no sense, plus they fart, flirt and pick their noses.