article_snippet: Beavers build dams to flood areas and provide ponds.
article_snippet: Dams typically range in size from a few feet to more than 300ft wide, although one was once recorded as spanning 2,800ft.
article_snippet: North American beavers impact on the surrounding landscape (dam in River Otter, pictured), fish stocks and landowners including farmers, will also be monitored over the coming years .
article_snippet: Peter Burgess of the Devon Wildlife Trust said North American beavers could have a hugely beneficial impact on rivers, reducing numbers of trees on the banks, improving light levels, and reducing flood risk by controlling water flow with the banks dams.
article_snippet: Beavers are herbivorous rodents that build corridors in Beavers dams to escape predators such as wolves and bears in the wild.
article_snippet: each of the beavers impact on the surrounding landscape, fish stocks and landowners including farmers, will also be monitored.