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 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 co-production of Tigress Productions Limited and Thirteen/WNET New York in association with British Broadcasting Corporation ; producer, Linda Bell ; director, David Allen
a National Geographic Television and Survival Anglia Limited co-production ; executive producer, David Royle ; producers, Bruce Davidson, Cynthia Moses ; writers, Bruce Davidson, Cynthia Moses, William Clark