A Beaver has an enormous amount of power in it's jaws. It's teeth are hard as stone. They fell trees very fast. It is amazing how their instinct tells them how, where and when to build a dam. Engineers scratch their heads even today, when they try to figure out the same thing. It has been proven, that if left alone, the Beaver will benefit the availability of balanced water systems, without any problems of flooding through-out a whole land area, for miles.