Paul Giamatti

as Narrator (voice)

Akito Kawahara

as Self - Florida Museum of Natural History

Jesse R. Barber

as Self - Boise State University

Mary Jane Epps

as Self - Mary Baldwin University

Aaron Pomerantz

as Self - PhD. Student at the University of California

Constantí Stefanescu

as Self - Natural History Museum of Granollers

Jason Chapman

as Self - Rothamsted Research

Peter R. Houlihan

as Self - Biologist (uncredited)