Bryan Simmons emerges from the Verdigris River with a freshwater mussel in hand while surveying mussels lining the bottom of the shallow southeastern Kansas river. A century of harvesting, pollution and changes to the mussels' habitat have caused more than 70 percent of the nearly 300 species found in the United States to be listed as threatened or endangered. Some mussels can filter out as much at eight gallons of water per day, creating a natural water filter that scientists say could help improve water quality in Kansas.
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