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Fast Ocean Facts — Sea Urchins Breathe Through Their Feet! - YouTube
Morro Bay Wildlife Spotlight: Balls of Spines (AKA Sea Urchins)
Physiology - The Purple Sea Urchin Resource
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A Guide to the Sea Urchin Reproductive Cycle and Staging Sea Urchin
Watch sea urchins turn themselves inside out to be reborn | PBS NewsHour
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