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16 famous animal conservationists

Jack Hanna with an owl perched on his hand

Photo: Frederick M. Brown/Getty Images

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Jack Hanna

Jack Hanna is best known as the host of "Jack Hanna’s Into the Wild" (following his original show, "Jack Hanna’s Animal Adventures"), and as a wildlife correspondent for major TV shows like "Good Morning America," "The Late Show with David Letterman," "Larry King Live," "The Ellen DeGeneres Show" and others. But Hanna gained his fame as the director of the Columbus Zoo and Aquarium in Columbus, Ohio. "Jungle Jack" currently hosts "Jack Hanna’s Wild Countdown."

He started Jack Hanna's Heroes to support animal conservation groups all over the world.