The tone of the writing is that of a dime-store detective novel, and the cartoonish illustrations present the information in the form of rap sheets, but within this silly format is a lot of substantial information about animals with which many readers may be unfamiliar. The common theme running through to connect the animals that are included is that each exhibits some sort of behavior that could be considered anti-social: the Anglerfish is wanted for illegal fishing, the Common Cuckoo for bad parenting, the llama for assault, etc.