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Q&A Tiny crab/bug in Pacific NW; makes shell out of rocks/sticks. What is it?

We encountered these guys in a small inland (freshwater) creek in southern WA. There were hundreds, covering low flat rocks in the water; every one carrying a shell made out of either tiny rocks,...

1 answer  ·  posted 8y ago by Jeremy Nikolai‭  ·  last activity 5y ago by System‭

Question bugs bug-identification