Red or purple sea urchins, Strongylocentrotus franciscanus (A. Agassiz, 1863), aka giant red/purple sea urchins, are colorful creatures, varying between a uniform red and dark burgundy, that crawl slowly over the sea bottom using their spines as stilts. … They are close relatives of sea cucumbers.
Size approx 10cm
For more info about urchins https://marinebio.org/species/red-sea-urchins/mesocentrotus-franciscanus/
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