Quagga mussel shells are very sharp and will cut you if you touch them. https://www.nps.gov/glca/learn/news/protect-feet-and-paws-from-sharp-quagga-mussel-shells-on-lake-powell-shorelines.htm

Source:: Protect Feet and Paws from Sharp Quagga Mussel Shells on Lake Powell Shorelines

      

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