Marty Becker

Known as America's Veterinarian; Featured on Vetstreet

Matt Passmore

Matt Passmore is an Australian actor. He is known for McLeod's Daughters, Blue Heelers, and his first American television show, The Glades.

Michael Archer

Paleontologist Michael Archer is working to bring back his favorite extinct animal: the Tasmanian tiger.

Chris Lilley

Comedian; Best Known for his Creation and Portrayal of the Character "Ja'mie King"

Simon Lovell

English Comedy Magician, Card Shark Actor and Con Man

Tom Hardy

English Actor Known for "This Means War," "The Dark Knight Rises," "Inception." & "Mad Max"

Jason Clarke

Actor, Best Known for "Brotherhood" and "The Great Gatsby"

Luke Mitchell

Australian Actor and Model; Known for Starring in TV Series "Home and Away"

Dave Salmoni

Animal Planet Television Personality & Large Predator Expert

Simon Baker

Actor & Director; Known for "The Mentalist"

Matt Damon

Actor, Screenwriter & Producer; Co-Founder of Water.org; Expert Advocate on Global Water & Sanitation Crisis

Jarod Miller

Naturalist, Zoologist & Television Host

Joey Lawrence

Actor, Singer & TV Host; Known for his Role in "Melissa & Joey"

Eric Stonestreet

Actor & Comedian, Best-Known for "Modern Family"

Jason Biggs

Actor Known For His Roles in the "American Pie" Series and on "Orange Is The New Black" Among Others

Billy Bretherton

A&E Network's "Billy the Exterminator"; Expert in Pest Control

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

Martin Sheen

Award-Winning Actor Known for "The West Wing" & "Grace and Frankie;" Social Activist & Humanitarian

John O'Hurley

Television Personality, Host & Voice Actor; Best Known for "Seinfeld"

Kevin Nealon

Former Cast Member of 'Saturday Night Live'; Co-Star on Showtime's "Weeds"

Ty Murray

Retired Professional Bull Rider; Seven Time All Around Champion

Julian McMahon

Australian-American Actor

Bill Maher

Political Satirist & Host of HBO's "Real Time"

Ryan Kwanten

Actor, Known for his role as Jason Stackhouse on HBO's "True Blood"

Jack Hanna

Naturalist, Adventurer & Director Emeritus of the Columbus Zoo

Adrian Grenier

Actor Known for HBO's "Entourage"; Environmental Activist; UN Ambassador

David Duchovny

Actor, Writer & Director Known for "The X-Files," "Aquarius" & "Californication"

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Robert Irwin

Wildlife & Nature Conservationist, Photographer, Author, and TV Personality; Son of Steve Irwin, Owner of Australia Zoo

Robert Irwin Reveals His Most Feared Animal! | The Cheap Seats

Tom Oar

Cowboy, Star of the History Channel show, "Mountain Men"