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This healthy 2" Strongylocentrotus droebachiensis (Green Sea Urchin) was attached to a rock, hiding under another rock during the low tide.
Couldn't get close enough to the tide pool to get a better picture.
Hundreds and hundreds in sea otter-free areas.
Strongylocentrotus is a genus of sea urchins in the family Strongylocentrotidae containing several species.
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