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A closer look at thousands of mussels.
A closer look at thousands of mussels, which feed by filtering plankton and detritus from the water. Excessive silt from storm water and urban runoff can harm these filter feeders.
Photo by Alan Humphrey, USEPA Environmental Response Dive Unit. Original public domain image from Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use