Naturalist, Adventurer & Director Emeritus of the Columbus Zoo
Jack Hanna brings a cuteness explosion to 'GMA'
Author of the #1 National Best-Seller "Marley & Me: Life and Love with the World's Worst Dog"
John Grogan author of Marley and Me
Actress & Personal Style Blogger ; Best known for her role on ABC's "Revenge"
Veterinarian and star of Nat Geo Wild's "The Incredible Dr. Pol"
Ecologist & Writer
Host, "My Cat from Hell" & Author, "Cat Daddy: What the World's Most Incorrigible Cat Taught Me About Life, Love, and Coming Clean"