609594 external_news 1533929791 1533929791 Tiny, camouflaged snails are harming coral reefs already vulnerable to degradation from rising sea temperatures, overfishing and pollution. Biologist Mark Hay and others at the Georgia Institute of Technology discovered groups of thumbnail-sized snails preying on the coral species Porites cylindrica by sucking their fluid like a tick, and found that they can reduce coral growth by up to 43 percent in less than a month.

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