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Beavers have oversized, sharp front teeth—called incisors—that continually grow over their lifetime. These teeth are excellent tools to cut down trees, which beavers use to build and repair their lodges and to dam up rivers and streams.
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To help these mammals protect themselves from predators, beaver lodges can only be accessed through underwater tunnels. Most lodges have at least two different entrances.
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In addition to their underwater entrance tunnels, most beaver lodges include a feeding den, a nesting den and a source of fresh air. They provide a place for beavers to rest, hide from predators, raise their young and stay warm during the cold winter months.