Beavers and their dams play an important role in nature. Beaver Dams: The Good and the Bad. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species. With their large front teeth, a pair of beavers can easily chew through the trunk of a medium-sized tree. Beavers are the engineers of the rodent world. They fell trees by gnawing through their trunks, then use the branches to dam streams. by Jacob Silverman. Prev NEXT . Alan and Sandy Carey/Photodisc/Getty Images. The dams create a pond, in the middle of which the beaver family constructs an island made of more branches. Why do beavers build dams? But back to why beavers do all this. By constructing dams they create wetlands-- lush environments which attract fish, ducks, frogs and other creatures. First of all, if it weren't for their dams, beavers would be fairly easy prey.

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