by David Attenborough ; a BBC TV production in association with Australian Broadcasting Corporation, Turner Broadcasting System Inc. ; BBC Bristol ; executive producer, Peter Jones
director, Gillian Darling Kovanic ; narration written by Amanda McConnell and Bruce Martin ; produced by Tamarin Productions Inc. in association with the Discovery Channel, USA ... [and others]
written, produced and directed by Linda Garmon ; a Nova production by the WGBH/Boston Science Unit in association with BBC-TV, NDR International Hamburg and Nederlandse Omroepprogramma Stichting
Roadside Attractions ; The National Film Board of Canada presents ; a film by Sarah Polley ; produced by Anita Lee ; written and directed by Sarah Polley
Participant Media presents ; a Catalyst Films/Silverbush production ; a Lori Silverbush/Kristi Jacobson film ; produced by Julie Goldman, Ryan Harrington ; produced and directed by Kristi Jacobson and Lori Silverbush