From USFWS Southeast Region:
This #atriskspecies plays a vital role in our ecosystem. These are purple lilliput mussels, and like all mussels they act as a living water filter, moving as much as 8 gallons a day through their internal filtration systems. They even filter dangerous bacteria like E.coli.http://1.usa.gov/y3vPTq (Photo: Kendall Moles)
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