The Peter Laufer books Forbidden Creatures and No Animals Were Harmed differ in their focus on animals in that his own own opinions changed.
 The book explores the lives of those that either own exotic animals or have been captured for illegally smuggling them, with a strong focus on Travis, the chimpanzee who attacked Charla Nash in 2009. 
 The book explores what those who work with animals believe to be the line between using animals for entertainment purposes and abusing them. 
 Meanwhile, the author recounts how his own opinions changed about that line when he talks to the different people about their beliefs. 
