Dam builders : the natural history of beavers and their ponds

Summary: "Beavers are remarkable animals. They have teeth that self-sharpen and never stop growing, a heart that slows down, and valves that close in their ears and noses when they dive. Their tail is the most multi-purpose of any animal on this planet; in addition to communication, its many functions include serving as an air conditioner in summer and a food pantry in winter. Few animals in the world are as famous, or as infamous, because only humans have a geater ability to dramatically transform its environment. [This book] provides a comprehensive overview of the lives of beavers and the habitats that arise from their actions." --book jacket