I found this book really interesting, however it took a few chapters to really 'get into it,' because the first few focus on the history of New York's zoos where as I was keen to get into the detail about the wildlife and his career.
The author's passion for, and knowledge about, reptiles is infectious, and I learned a lot about snakes in particular - an animal I knew little about previously.
If you're at all interested in finding out more about what goes into caring for zoo animals, then I recommend this book. It's full of incredulous tales about the public keeping incredibly dangerous animals, about how to handle dangerous reptiles and first hand research into wildlife conservation. It should also come with a warning that you might want to change your career after reading this.