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Male Mediterranean fruit fly (Ceratitis capitata) is one of the world's most destructive fruit pests. Because of its wide distribution over the world, its ability to tolerate cooler climates better than most other species of tropical fruit fly, and its wide range of hosts, it is ranked first among economically important fruit fly species. (KEYSTONE/SCIENCE PHOTO LIBRARY/Javier Torrent, VW PICS/SCIENCE PHOTO LIBRARY)