The standard work on all currently described species of freshwater crayfish has now been newly revised, brought up to date, and enhanced with fascinating new photos. The authors have compiled their knowledge about these fascinating animals after several years of research and many trips to the countries of origin of the crayfish. Each species is precisely described, with its lifestyle and distribution documented. Brilliant photos showcase the diversity of this interesting group of animals. All nature enthusiasts, scientists, aquarists, and fish farmers will now have an organized overview of the variety of forms, colors, lifestyles, and behaviors of freshwater crayfish for the first time.