Cusco Amazónico by William E. Duellman is the result of nearly two decades of inventory in the areas of influence surrounding Inkaterra Reserva Amazónica (formerly called Cusco Amazónico, highlighting Madre de Dios’ proximity to Machu Picchu). Richly illustrated, it documents 151 species of amphibians and reptiles and their ecological patterns. As Kraig Adler of Cornell University states, “Cusco Amazónico will be the baseline against which all future studies of Amazonian amphibians and reptiles (and even other organisms) will be compared. No one is more qualified to create such a standard than William E. Duellman, whose contributions to neotropical herpetology are legendary.”