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
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
a co-production of Thirteen/WNET New York and BBC ; Educational Broadcasting Corporation ; written and edited by Mark Fletcher ; series producer, Bill Murphy ; executive producer, Fred Kaufman