Paul Giamatti
Narrator (voice)

Akito Kawahara
Self - Florida Museum of Natural History

Jesse R. Barber
Self - Boise State University

Mary Jane Epps
Self - Mary Baldwin University

Aaron Pomerantz
Self - PhD. Student at the University of California

Constantí Stefanescu
Self - Natural History Museum of Granollers

Jason Chapman
Self - Rothamsted Research

Peter R. Houlihan
Self - Biologist (uncredited)