Reparto (por orden de créditos)
Sue Perkins
Self - Narrator (voice)
Andrew Rannells
Ross Brooks
Self - Science Historian
Deborah DeLorenzo
Self - Penguin Keeper (Rosamond Gifford Zoo)
Danielle Edwards
Self - Herpetologist
Antonia Forster
Self - Biologist
Christopher Goatley
Self - Marine Biologist
Bradley Trevor Greive
Self - Author and Naturalist
Amy Parish
Self - Primatologist
Florence Schechter
Self - Founder and Director (The Vagina Museum)
Martin Stervander
Self - Ornithologist
Christine Wilkinson
