The average individual could walk through a creek without even noticing these small gems. In fact most people are completely unaware of their existence. Freshwater bivalves are a kind of freshwater molluscs. They are bivalves which live in freshwater, as opposed to saltwater. The majority of species of bivalve molluscs live in the sea, but a number of different families live in freshwater. Fresh water mussels can thrive in many different habitats small ditches, lakes, canals, rivers and creeks. While walking Mill creek with our summer youth program employees we found hundreds of fresh water mussels. The species we found is the Western Pearlshell (shown in all pictures). The Xerces Society is dedicated to developing a variety of publications that educate people on how to identify and conserve fresh water mussels, as well as manage their habitat. “The Society uses advocacy, education, and applied research to defend invertebrates”. For more information about fresh water mussels of the pacific northwest visit, http://www.xerces.org/western-freshwater-mussels/.