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As the other answer suggests, this is a sea urchin. Specifically, it appears to be a commonly caught species off Maine called Strongylocentrus droebachienisis, which is commonly called the green se...
Answer
As the other answer suggests, this is a sea urchin. Specifically, it appears to be a commonly caught species off Maine called Strongylocentrus droebachienisis, which is commonly called the green se...