Christian the Lion

It is almost exactly 40 years since two young Australians had what has become a famous encounter with a lion in the depths of the African bush.John Rendall and Anthony Bourke had come across "Christian" late in 1969, at what was then a zoo in the upmarket London department store, Harrods.Alan Johnston speaks to John Rendall about their decision to release him into the wild in Kenya and the extraordinary moment that became a YouTube sensation.