Nature

George Page

Narrator (voice), Host

Donald C. Johanson

Self

F. Murray Abraham

Narrator (voice)

David Attenborough

Host / Narrator (voice) / Self

Nora Young

Narrator / Narrator (voice)

Jay O. Sanders

Narrator (voice)

Toby Leonard Moore

Narrator / Narrator (voice)

Jayce Bartok

Narrator (voice)

Gordon Buchanan

Host

Chris Morgan

Narrator / Narrator (voice)

Brian Unger

Narrator

Kevin Draine

Narrator (voice)

Olga Merediz

Narrator / Narrator (voice)

Nyambi Nyambi

Narrator (voice)

Allan Peck

Narrator (voice)

Allison Argo

Narrator / Narrator (voice)

Daniel Stern

Narrator (voice)

Uma Thurman

Narrator (voice)

Paul Giamatti

Narrator (voice)

Campbell Scott

Narrator (voice)

Russell Boulter

Narrator (voice)

JuJu Chang

Host

BD Wong

Narrator / Narrator (voice)

Paul Christie

Narrator / Narrator (voice)

Laila Robins

Narrator / Narrator (voice)

Jason O'Mara

Narrator (voice)

James Naughton

Narrator (voice)

Lynn Sherr

Narrator (voice)

Michael Gross

Narrator (voice)

Christopher Plummer

Narrator (voice)

Peter Coyote

Narrator (voice)

Ewan McGregor

Host / Narrator (voice)

Tim Matheson

Narrator (voice)

Colin Stafford-Johnson

Narrator (voice)

Kate Winslet

Narrator (voice)

Noma Dumezweni

Narrator (voice)

Scott Brick

Narrator (voice)

Ana Gasteyer

Narrator (voice)

Niobe Thompson

Host

Tom Harges

Narrator (voice)

Ronald H. Cohn

Self - Director of Gorilla Foundation

Kevin Connelly

Self - Coordinator of Gorilla Foundation

Francine G. Patterson

Self - Koko's caretaker

Mdume

Self

Michael

Self

Liev Schreiber

Narrator (voice)

Ed Trucco

Narrator (voice)

Howard McGillin

Narrator (voice)

Romulus Whitaker

Narrator (voice)

Linda Hunt

Narrator (voice)

Stockard Channing

Narrator (voice)

Mark Hamill

Narrator (voice)

Will Patton

Narrator (voice)

Laura Dern

Narrator (voice)

John Ritter

Narrator (voice)

Patricia Clarkson

Narrator (voice)

Anthony LaPaglia

Narrator (voice)

Kate Humble

Narrator (voice)

Edward Herrmann

Narrator (voice)

Julia Roberts

Host

Simon King

Narrator (voice)

Joe Morton

Narrator (voice)

Timothy Dalton

Host

Hardy Jones

Host

Henry Winkler

Narrator (voice)

Joe Hutto

Host

Liam Neeson

Narrator (voice)

Meg Ryan

Host

Richard Thomas

Narrator (voice)

Hugo Kitching

Narrator (voice)

Beverly Joubert

Narrator (voice)

Dereck Joubert

Narrator (voice)

Kevin Kline

Narrator (voice)

Koko

Self

Martin Sheen

Narrator (voice)

Alan Ereira

Narrator (voice)

Thomas Haden Church

Narrator (voice)

Bill Pullman

Narrator (voice)

Howard Hall

Narrator (voice)

Thoren Ferguson

Narrator (voice)

Samuel Gilbert-Davies

Re-enactor

Ben Masters

Narrator (voice)

John-Christian Bateman

Narrator (voice)

James Lurie

Narrator (voice)

Martin Dohrn

Narrator (voice)

Anja Taylor

Self - Narrator (voice)

Mark Emery

Narrator (voice)

Tom Mustill

Narrator (voice)

David Scheel

Host

Maria Diekmann

Self

Keith David

Narrator

Charlie Russell

Self

Jonathan Kingdon

Self

George H. Page

Narrator

Susane Lee

Narrator

George H. Page

Narrator

Nancy Lewman

Narrator

Jane Goodall

Self

George Page

Narrator

Tom Park

Self - Narrator (voice)

Jeremy Irons

Narrator