They seem to be nocturnal, I only ever see them at night. They are smooth to the touch, not prickly. Viewed from an observation tank prior to being released back into the creek.
Viewed from the side in an observation tank. Very common in the creek.
Flock of 10-20 residents since October here in the industrial area of Milwaukie
predated shell in riparian zone
in acidic peat bog
Hard to see, but it's in the middle of the picture
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