Although the book is very interesting and good writen, it has some untrue statements that made me almost close the book and never open it again.
Peter J. Bentley claims in his first (chapter 0) that humans are the only creatures on earth to make use of language, and the only ones to 'speak numbers'.
I think Peter needs to do more research around that because a lot of animals and insects have a language and almost all animals can count.
If he may claim that animals don't count like humans than he contradict himself in the same chapter by saying "Many thousands of years oga, when people didn't speak many words, people knew numbers.