Warner Bros. and Universal Pictures present a Guber-Peters production ; screenplay by Anna Hamilton Phelan ; story by Anna Hamilton Phelan and Tab Murphy ; produced by Arnold Glimcher, Terence Clegg ; directed by Michael Apted
an IMAX Natural History Film Unit production in association with the National Geographic Society and IMAX ; producer, Sally Dundas ; narration writer, Steve Lucas ; director, Adrian Warren
a co-production of Visty/Brennan Productions and Thirteen/WNET in association with the Gorilla Foundation/koko.org ; written & produced by Bonnie Brennan & Robert Visty ; producers, Jill Clarke, Jessica Siegel
Omni Film Productions ; produced with the participation of Telefilm Canada in association with British Columbia Films ... [and others] ; produced by Christian Bruyere, Ian Herring
the Pennsylvania State University PCR Films in the Behavioral Sciences ; [presented by] the New York Zoological Society, the Pennsylvania State University, the National Science Foundation ; written by George B. Schaller ; produced by the Pennsylvania State University
produced by Spectrum Field Productions LLC for Animal Planet ; executive producers, Guy Nickerson, Jim Rapsas ; director, Guy Nickerson ; producer, Sara Helman
MC4 and Matin & Soir Films with the participation of Canal+ Horizons, Centre Nationale de la Cinematographie, Planete and Discovery HD Theatre ; produced by Jean-Pierre Bailly ; directed and written by Emmanuel Robin