a BBC Studios Natural History Unit production ; a co-production with BBC America, Tencent, WDR, France Televisions and CCTV9 ; a BBC Open University partnership ; executive producer, James Honeyborne ; series producer, Mark Brownlow ; producers, Miles Barton, Orla Doherty, Kathryn Jeffs, Will Ridgeon, John Ruthven, Jonathan Smith
A production of The Documentary Guild in association with WGBH Boston for Nova ; WGBH Educational Foundation ; Executive editor, William Grant ; executive producer, Paula S. Apsell ; written, produced and directed by Rob Whittlesey and Noel Buckner
an ArtMattan Productions release ; Periscope Productions and BBC, ZDF, Arte, IKON, VRT, RTBF, YLE, and in association with History Television, SBS Television, and Danmarks Radio ; produced by Paul Pauwels, Nick Fraser, Olaf Grunert, Wessel van der Hammen, Philippe Van Meerbeck, Bill Binnemans, and Iikka Vehkalahti ; written and directed by Peter Bate