Reparto (por orden de créditos)
Bob Brisbane
Narrator
Rui Seabra Ferreira Jr.
Self - Director of CEVAP at Sao Paulo State University
Vidal Haddad Jr.
Self - Associate Professor at Botucatu Medical School in Sao Paulo State University
Justin Schmidt
Self - Biologist
Richard Rasmussen
Dean Ripa
Self - Owner of Cape Fear Serpentarium
Brien Foerster
Self - Guide and Professional Adventurer
Bryan Grieg Fry
Self - Biochemist and Moleculair Biologist at University of Queensland
Greivin Carrales
Self - Herpetologist at Clodomiro Picado Research Institute
Paul Rosolie
Self - Naturalist and Explorer
William Muth
Self - Infectious Diseases Specialist at Samaritan Health Services
Gerardo Aldana
Self - Anthropology and Chicana Studies at UC Santa Barbara
Oscar Miro-Quesada
Self - Psychologist and Healer and Earth Ritualist
Mahmood Sasa Marin
Self - Professor and Biologist of Clodomiro Picado Research Institute
Gregory Erickson
Self - Crocodilian Biologist
Martin Nicholas
Self - Spider Expert
George Burgess
Self - Director of Florida Program for Shark Research
Ian Recchio
Self - Herpotologist
Florian Graner
Self - Marine Biologist and Filmmaker
Greta Binford
Self - Associate Professor of Biology at Lewis & Clarke College
Robert Espinoza
Self - Reptile Expert at California State University
Maritza Sepúlveda
Self - Marine Ecologist of University of Valparaiso
Mark Sabaj Pérez
Self - Interim Curator of Fishes at Academy of Natural Sciences at Drexel University
Jesús Olivares
Self - Neuroscience PhD at University of Valparaiso
Jonathon Becker
Self - American Crocodile Victim
Rebecca Cliffe
David Zeledon
Self - Killer Bee Victim
Christiane Weirauch
Self - Professor of Entomology at University of California
Giuseppe Puerto
Self - Biologist and Director at Biological Museum Instituto Butantan
Emiliano Donoadio
Self - Zoologist and Ecologist
Gerald S. Wilkinson
Self - Department of Biology at University of Maryland
Piotr Naskrecki
Self - Entomologist of Museum of Comparative Zoology at Harvard University
Vanessa Van Der Linden
Self - Pediatric Neurologist
Audrey Benton
Self - Fer-De-Lance Victim
Salvador Hernandez
Self - Project Manager of Olive View-UCLA Medical Centre
Constancia Ayres
Self - Lead Mosquito Researcher of Oswald Cruz Foundation
Stephen Rankin
Self - Executive Producer of 'Naked and Afraid'
Dawn Brancheau
Self - Killer Whale Victim
Stuart Hine
Self - Entomologist
Demian Chapman
Self - Associate Professor of Marine Sciences at Florida International University
Kenneth Iserson
Self - Professor Emeritus, Emergency Medicine, University of Arizona
Bradley James Baker
Self - Bot Fly Victim
Denise Maria Candido
Self - Biologist at Insituto Butantan
Nicole Duplaix
Self - Chair, Otter Specialist Group at Oregon State University
Judy Avey-Arroyo
Self - Founder and Owner of The Sloth Sanctuary
Amalin Haddad
Self - Puma Witness
Kenneth Catania
Self - Professor of Biological Sciences at Vanderbilt University
Stephen Scourfield
Self - Travel Editor, The West Australian and Seven West Media
Beth Astles
Self - Keeper at Hunter Valley Zoo
Leslie Ann Knapp
Self - Professor and Chair of Anthropology of University of Utah
Adam Brandt
Self - Assistant Professor of Biology at St. Norbert College
Warren Savary
Self - Field Associate of California Academy of Sciences
Joseph Gillespie
Self - Assistant Professor of Microbiology and Immunology of University of Maryland
Edgar Alvin Harrell
Self - USS Indianapolis Survivor
David H. Oi
Self - Research Entomologist of US Department of Agriculture ARS
Rafael Samuido Fernándoz
Self - Ecologist and Mammalogist of Panama
Mônica Lopes-Ferreira
Self - Biologist and Toxologist of Instituto Butantan
Roberto Moraes
Self - Scientific Researcher, Instituto Butantan
Liliana Pérez Frost
Self - Recluse Spider Victim
Marcelo Bahia Labruna
Self - Vetenarian Professor of University of Sao Paulo
Mario Palma
Self - Professor in Biochemistry at Sao Paulo State University
Sarah Thompson
Self - Mother of Audrey, Fer-de-Lance Victim
Richard Cross
Self - Behavioural Ecologist and Retired Professor of Psychology
Juan Campos
Self - Assistant Professor at University of Florida
Andy Tillman
Self - Llama Expert and Founder of US Llama Industry
Jim Hatfield
Self - Iguana Researcher, Lecturer and Author
Deise Nishumura
Self - Biologist and Black Caiman Victim
Maira Guttierrez
Self - Assassin Bug Patient
Fabián Bonilla-Murillo
Self - Biologist of Clodomiro Picado Research Institute
Lauren Evill
Self - Zoo Keeper of Perth Zoo
Olivia Katherine Baker
Self - Victim's Wife
Danilo Chacon
Self - Venemous Snake Expert of Clodomiro Picado Research Institute
Lindsay Renner
Self - Lead Keeper of Primates of Utah's Hogle Zoo
Adriana Consorte-McCrea
Self - Chair, Wildlife and People Initiative at Canterbury Christ Church University
Mario de Pinna
Self - Curator of Museum of Zoology at University of Sao Paulo
Mario Urriola
Self - Biologist of Fauna Conservation
Patrick McNulty
Self - Lifeguard at Tamarindo Beach
Nancy Black
Self - Marine Biologist of Monterey Bay Whale Watch
Elizabeth Congdon
Self - Assistant Professor of Bethune-Cookman University
Kari Bagnall
Director of Jungle Friends Primate Sanctuary
Cristian Bonacic
Self - Professor, Wildlife Conservation
William Crampton
Self - Associate Professor of Vertebrate Biology at University of Central Florida
Scott Cassell
Self - CEO of Undersea Voyager Project
Maira Gutierrez
Lorenzo Sympson
Self - Ornithologist
Ricardo Bravo
Self - Professor at University of Valparaiso
Euan Allen
Self - Schistosomiasis Expert at Oregon State University
Rafael Antelo
Self - Scientific Director of Palmarito Foundation
Francisco Arroyo Murillo
Self - Vetenarian of the Sloth Sanctuary
Poldi Furlan Mouat
Self - Park Manager, Santiago, Chile
Jackson Landers
Self - Black Widow Spider Victim
Fabio Hazin
Self - Professor at Federal Rural University of Pernambuco
Mariella Superina
Self - Research Scientist of CONICET
Rozilene Fereira de Mequita
Self - Mother of Arthur with Zika Victim
Viviane Coentro
Re-enactment Cast
Jorge Morero Daza
Hebert Calapuja
Bianca Liberona
Sebastian Arredondo
Drew Cordell
Mariana Coentro de Souza
Marijod Trigo
David Nicholson