Helmet urchins

Helmet urchins on the North Kohala coastHelmet urchins on the North Kohala coast
Helmet urchins feed on algae at the water’s edge where they move about on little tube legs. I can’t claim to have witnessed any such activity, but for creatures that apparently just sit there, I find them quite cheerful and entertaining. Perhaps I should get out more.

To identify this, I used John P. Hoover’s book Hawai‘i’s Sea Creatures: A Guide to Hawai‘i’s Marine Invertebrates. His website is hawaiisfishes.com.

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