Gordon Buchanan, Anna Dimitriadis and Vianet Djenguet embark on a six-month expedition following lions, leopards and cheetahs in Botswana's Okavango Delta. Gordon films one of the largest lion prides in Africa as they hunt to feed 28 hungry mouths, while Anna tracks down the region's most elusive big cat, the cheetah. Local wildlife film-maker Brad Bestelink reunites with his favourite leopardess Xudum, but a huge wildfire threatens the resident big cats, and the team