Australia's Great Barrier Reef hosts the elegance coral, Catalaphyllia jardinei, shown above, left. The picture comes from Corals of the World by J. E. N. Veron (3 vols; Australian Institute of Marine Science, A$265). In the Indo-Pacific, the Bennett's butterflyfish, Chaetodon bennetti (right), feeds primarily on coral polyps, and is among the species affected by the mass coral mortality — from World Atlas of Coral Reefs by Mark D. Spalding, Corinna Ravilious and Edmund P. Green (University of California Press, $45, £29.95), which details the state of the world's coral reefs.