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TOUGH TIMES
Porites pukoensis coral (top left, close-up of polyps each some 2 millimeters in diameter when expanded) now ranks as critically endangered. Corals are beset by invading species such as the crown of thorns starfish (lower left, in the Philippines) and Drupella gastropods (damage on Acropora coral in Australia's Great Barrier Reef). Credit: D. Potts; S. Livingstone; C. Page

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