Wildlife Photographer Builds A 'Photo Ark' For Thousands Of Animal Species National Geographic photographer Joel Sartore is documenting the world's captive animal species. His new book is Vanishing: The World's Most Vulnerable Animals. Originally broadcast Feb. 27, 2017.

Wildlife Photographer Builds A 'Photo Ark' For Thousands Of Animal Species

Wildlife Photographer Builds A 'Photo Ark' For Thousands Of Animal Species

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National Geographic photographer Joel Sartore is documenting the world's captive animal species — currently around 9,000 and counting. His new book is Vanishing: The World's Most Vulnerable Animals. Originally broadcast Feb. 27, 2017.