This book is very interesting in the choice of animals it makes and has interesting facts about the Amazon and its species. However, its proposition to be a full guide is too ambitious and cannot be achieved in so short a space.
Some of the most significant deficiencies relate to the flora, which is only sparsely described. It is not too helpful in identifying species, especially given the abundance of the region.
I recommend this guide to an amateur who is interesting in identifying a few species, especially of fauna, who is not too particular about identifying specific ones. It is full of interesting facts that a first time visitor would certainly enjoy.