a BBC/Discovery Channel/NHK co-production, in association with the CBC ; series producer, Alastair Fothergill ; producers, Penny Allen, Vanessa Berlowitz, Mark Brownlow, Andy Byatt, Huw Cordey, Jonny Keeling, Mark Lindfield
WGBH Educational Foundation ; a Canadian Broadcasting Corporation production for WGBH/FRONTLINE ; producer, Lisa Ellenwood ; written, produced & directed by Neil Docherty