Sworls of Montipora aequituberculata, a core coral, attract fish at Jarvis Island National Wildlife Refuge in the Pacific, about 1,300 miles southwest of Honolulu. (Jim E. Maragos/USFWS)

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Sworls of Montipora aequituberculata, a core coral, attract fish at Jarvis Island National Wildlife Refuge in the Pacific, about 1,300 miles southwest of Honolulu. (Jim E. Maragos/USFWS).