Crown-of-Thorns Sea Stars
Crown-of-thorns sea stars—like this group on Kingman Reef in the Pacific—can inflict a painful sting to humans, but they are far more dangerous to corals. Outbreaks of this fast-spreading sea star can cause high mortality on reefs where they feed. Scientists aren’t sure exactly what causes such outbreaks, or what their ultimate impacts may be on coral reef health.
(source:google/http://ocean.nationalgeographic.com/)
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