Crown of thorns starfish normally live in high population densities.

刺冠海星通常生活在聚居的环境中。

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The crown of thorns starfish is a coral reef predator that preys on coral polyps.

刺冠海星是一种以珊瑚虫为食的珊瑚礁捕食者。

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The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.

棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。

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The remaining two-fifths, they say, was predation by the crown-of-thorns starfish.

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The World Wildlife Fund offers a commercial tour in Palau, Micronesia on which snorkelers can help their guide remove the invasive crown-of-thorns starfish, which every day eat their weight in coral polyps from fragile reefs.

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John Gunn, head of AIMS, said it was difficult to stop the storms and bleaching but researchers could focus their short-term efforts on the crown-of-thorns starfish, which feasts on coral polyps and can devastate reef cover.

BBC: Half of Great Barrier Reef coral lost in last 27 years