Only Jack Hanna Can Make David Letterman Put an Animal In His Shirt 1.48K Lisa Gagliardi 01/18/11 03:47PM Filed to: The Late Show The Late Show jack hanna TV Animals Video Somehow animal guru Jack Hanna convinced David Letterman to invite "the smelliest animal in the world" into his shirt. It's called a zorilla and though cute, I bet he could really scratch you up.[There was a video here]