Quick facts about these brightly colored sea urchins that are abundant in Hawaii. The slate pencil urchin (Heterocentrotus mamillatus, red slate pencil urchin, red pencil urchin, ula ula). Slate pencil urchin facts! They are also featured in Animal Crossing.

#ocean #learn #urchins #echinoderms #cool #marinelife #nature #science #hawaii #coralreefs

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