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You might assume beavers cause floods. They build dams to create waterlogged habitats. But some supporters say they can actually prevent flooding by keeping more water in uplands, away from people. "Beavers build dams and they complicate and slow down water," Louise Ramsay, from the Scottish Wild Beaver Group, told the BBC. "They braid the streams [creating a network of small channels] and they will block ditches."
There is still flooding but the ideal is for it to happen upstream in upland areas where less harm will be done. "You'll have lots of little pools. You've got the water coming more slowly down from the uplands into the low ground."
A beaver dam in Canada's Wood Buffalo National Park spans about 2,800 feet.
- Several generations of beavers have worked on the dam since the mid-1970s and it's still growing.
Beavers on your property also attract their natural predators which can cause you even more animal problems. The poor little rodents are favorite food items for creatures such as coyotes, bears, bobcats, wolves and mountain lions