A book contains collection of stories of animal gesture to communicate with other species or their own species. Those serve intriguing ideas that we can correlate it as the language we know as human. Since the writers’ background is more in philosophy not in animal behavior, her purpose on writing this book is to offer new perspective about non-human animal language, that most philosophers believe human language is more superior than sound or movement made by other species. 

This book will be stronger if she supported her theory with knowledges in animal anatomy and psychology. So it is not too generalized. For instance, in chapter two she mentioned how dogs are universally relying on scent than on sight. Which neglecting the fact, hounds are divided into two types: scent-hound (such as Beagle and Basset Hound) and sight hound (such as greyhound, which is why they are triggered by a doll rabbit during a race).