a production of Florentine Films and the Television Laboratory at WNET/Thirteen ; a film by Ken Burns, Amy Stechler Burns ; written by Amy Stechler Burns, Wendy Tilghman, Tom Lewis ; produced by Ken Burns and Amy Stechler Burns
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
written and produced by Christine Lesiak ; co-produced by Matthew L. Jones ; a production of the Native American Public Broadcasting Consortium and the Nebraska Educational Television Network for the American experience ; presented by WGBH/Boston, WNET/New York and KCET/Los Angeles
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