Top 7 Most Hazardous Sea Creatures - Page 3 of 9

Sea urchins, the hedgehogs of saltwater masses

The sea urchin is essentially a large collection of extremely sharp spines that you should steer clear of. The flower sea urchin is highly venomous in spite of his flower-like appearance and numerous death cases as the result of its poison have been recorded. However, even getting stung by the non-venomous varieties is dangerous, because the needles can break inside the skin/tissue and will necessitate a surgical intervention.