Beavers are remarkable animals. They have teeth that self-sharpen and never stop growing, a heart that can slow down, and valves in their ears and noses that close 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. Also, few animals are so famous--or infamous--because only humans have a greater ability to dramatically transform the environment around them. Dam Builders provides a comprehensive overview of beavers and the habitats that arise from their actions. Approximately 400 photographs provide intimate insights into the lives of beavers and the inhabitants of their ponds and related environments. Many new observations and rarely seen moments--such as beavers fighting--are documented.--From publisher description.