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
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