From endangered to pest.

• Position: WILDLIFE - Beaver - Brief article

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The humans in Lexington, Massachusetts, are stumped: Beaver dams are causing water to flood the town's sewer system. Trapping the beavers does no good: Others move in. Destroying the dams doesn't work: The animals rebuild them, sometimes within a day. Beavers were nearly extinct in 1900, thanks to 300 years of demand for beaver-felt hats. But decades of conservation efforts have brought many species back from the brink--and beavers, alligators, and other...