John Varty (JV) is a South African conservationist and filmmaker who specialises in big cats. JV established Tiger Canyons near the town of Philippolis on the Van der Kloof Lake in the Karoo of South Africa as an experiment to create a free-ranging, self-sustaining tiger population outside Asia. From this population, third and fourth generations of tigers can be returned to Asia into parks that meet a set of criteria which give the tigers a chance of surviving in Asia. He successfully introduced a lion cub into a tiger litter to test if a tigress would adopt a cub which is not their own. This way genetic diversity can be increased in populations of wild tigers where inbreeding is occurring.