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
a production of Thirteen and ArgoFilms in association with WNET.org for PBS ; written, produced and directed by Allison Argo ; executive producer, Fred Kaufman ; series producer, Bill Murphy
a Nova production co-produced by Pioneer Film and Television Productions Limited with China International TV Corporation with CCTV-10 and PAAN Media Holdings Co. Limited, with KBS Korea in association with PBSd, for WGBH and KBS ; series director, Kate Dart ; senior series producer, Melanie Wallace
a co-production of Tigress Productions Limited and Thirteen/WNET New York in association with British Broadcasting Corporation ; producer, Linda Bell ; director, David Allen
a production of Pontecorvo Productions and Thirteen in association with Wildlife Media, National Geographic Channel and WNET New York Public Media ; writer, producer, and director of photography, Joseph Pontecorvo
narrated by David Attenborough ; producer, John Ruthven ; series producer, Mark Brownlow ; a BBC Studios Natural History Unit production ; a co-production with BBC America, Tencent, WDR, France Televisions and CCTV9
produced by Pioneer Productions for National Geographic Channel ; executive producers, Simon Andreae and Andrea Florence ; directors, Stefanie Kern and Lorne Townend
Pontecorvo Productions and Thirteen Productions LLC in association with National Geographic Channel, Sky Vision and WNET ; produced and written by Joe Pontecorvo
producer, Miles Barton ; director, Theo Webb ; BBC Studios, the Natural History Unit ; a co-production with BBC America, Tencent Penguin Pictures, France Télévisions and CCTV9
director, Susan Fleming ; writers, Siobhan Flanagan, Gary Lang ; producer, Susan Fleming ; a production of Coy Wolf Inc. in association with Thirteen Productions LLC for WNET
produced by Primitive Entertainment and Films à Trois in co-production with the National Film Board of Canada ; produced in association with Centre National de la Cinématographie ; directed by Nick de Pencier ; narration written by Elizabeth Arledge ; produced for NOVA by Elizabeth Arldege
a Nova/WGBH, La Cinquième, Südwestrundfunk, Gedéon Programmes, Meridian, and NHK co-production ; produced for Nova by Providence Pictures, Inc. for WGBH/Boston ; written and directed by Liesl Clark