출연진
Stuart Brown
Self (Play Researcher)
Mariana Brussoni
Self (Developmental Psychologist)
Gordon Burghardt
Self (Reptile Researcher)
Matthew Cooper
Self (Neuroscientist)
Geoff D'Eon
Narrator (voice)
Ellen Beate Hansen Sandseter
Self (Child Psychologist)
Kathy Hirsh-Pasek
Self (Developmental Psychologist)
Kathryn Kegel
Self (Seattle Aquarium)
Elisabetta Palagi
Self (Primate Researcher)
Sergio Pellis
Self (Neuroscientist)
Jonathan Pruitt
Self (Behavioral Ecologist)