Living with Tigers is a 2003 documentary about tigers in Africa. It aired on Discovery. The sequel to Living with Tigers is Tiger Man of Africa on the National Geographic Channel. This documentary features a Bengal tiger re-wilding project started by John Varty in 2000. This project involves training captive-bred Bengal tiger cubs by their human trainers so that the tigers can regain their predatory instincts. Once they prove that they can sustain themselves in the wild, they would be released into the wilderness of Africa to fend for themselves. Their trainers, John Varty and Dave Salmoni, have to teach them how to stalk, to hunt, and, most importantly, to associate hunting with food. It is claimed by some that two Bengal tigers have already succeeded in re-wilding, and two more tigers are currently undergoing their re-wilding training. This project is featured by The Discovery Channel as a documentary, Living With Tigers. It was voted one of the best Discovery Channel documentaries in 2003. A strong criticism about this project is with the chosen cubs. Experts state that the four tigers involved in the re-wilding project are not purebred Bengal tigers and should not be used for breeding. The four tigers are not recorded in the Bengal tiger studbook and should not be deemed as purebred Bengal tigers. Many tigers in the world's zoos are genetically impure, and there is no reason to suppose these four are not among them. The 1997 International Tiger Studbook lists the current global captive population of Bengal tigers at 210 tigers. All of the studbook-registered captive population is maintained in Indian zoos, except for one female Bengal tiger in North America. It is important to note that Ron and Julie were bred in the USA and hand-raised at Bowmanville Zoo in Canada, while Seatow and Shadow are two tigers bred in South Africa.