Tag Archives: periwinkle

Invertebrate of the Week: Helmet Urchin

Also known as shingle urchins, or hāʻukeʻuke in Hawaiian,  helmet urchins have evolved to resist strong wave action and drying out (which is why they can tolerate being exposed to air).  This huge south swell would be no problem for a helmet urchin!  Its unique design allows it to stay firmly in place on rocks […]

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