Crown-of-thorns Starfish

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Crown-of-thorns Starfish,
Oceana.org,

The Crown-of-thorns Starfish is a sea star named for the spines that cover its body and arms. These spines are somewhat flexible in life and are used for locomotion and for defense from potential predators. This species is a well-known coral predator, and outbreaks of tens of thousands of individuals have been known to cause serious harm to coral reefs in some areas.