Nature’s 'miracle': How 58 beavers turned a volcanic wasteland back into a thriving home.

In 1980, Mount St Helens buried a river valley in volcanic sediment. Over the last five years, nearly 60 beavers helped turn the wasteland into a thriving wetland. Their dams created new habitats for plants and animals. Now, a planned government project might bury this restored area under more sediment.