The Invisible Ark: In Defense of Captivity by David and Tracy Barker 2014. This is a small paperback book that explains the importance of captivity in this modern world and promotes the work of the keepers of all animals and plants.
Excellent book! The blank white cover didn't catch your attention but the title did. It's a very informative read and I understand the premise of the invisible ark and it's importance regarding salvaging what animal species remain.