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 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
director, Susan Fleming ; writer, Ted Remerowski ; produced in association with the Canadian Broadcasting Corporation ; in association with ARTE France ... [and others] ; produced by A Murder of Crows Inc
narrated by Paul Christie ; directed & produced by Tom Mustill ; AGB Films with Gripping Films for Thirteen Productions LLC and BBC in association with WNET
narrated by Jimmy Smits ; directed and written by Peter Fison ; producer, Charlotte Lathane ; a Windfall Films West Production part of the Argonon Group for Thirteen Productions LLC and BBC Studios in association with WNET