written and produced by Graham Chedd ; directed by Larry Engel ; a co-production of Chedd-Angier-Lewis Productions and Thirteen in association with WNET.ORG
produced by Spectrum Field Productions LLC for Animal Planet ; executive producers, Guy Nickerson, Jim Rapsas ; director, Guy Nickerson ; producer, Sara Helman
by David Attenborough ; a BBC TV production in association with Australian Broadcasting Corporation, Turner Broadcasting System Inc. ; BBC Bristol ; executive producer, Peter Jones
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
produced by Red Apple Entertainment in association with the Canadian Broadcasting Corporation ; written and directed by Marc de Guerre ; produced by Alan Mendelsohn
presented by Thirteen for WNET.ORG ; Distributed by American Public Television ; A ParnassusWorks Film ; produced and directed by Richard Rifkind, Carole Rifkind
written, produced and directed by John Rubin ; a production of NOVA and National Geographic Television in association with John Rubin Productions, Inc. ; WGBH Boston
a co-production of Natural History New Zealand, NHK (Japan Broadcasting Corporation), Discovery Channel, & NDR Naturfilm Studio Hamburg & Fernseh Allianz ; directors, Jeremy Hogarth, Stephen Downes