This book presents information on common-to-rare organisms from around the world that inhabit freshwater habitats. The first six chapters focus on organisms from the very small (e.g., protozoa, zooplankton, and fairy shrimp) to the huge (e.g., hippos, freshwater sharks, and giant turtles), while the last four chapters provide information on aquatic ecosystems (lakes, streams, caves, and wetlands). Included in this last section are the physical nature...