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In the crab spider, Misumena vatia, Douglass H. Morse and his colleagues found an ideal species on which to test basic questions associated with lifetime fitness. From the moment a female crab spider selects a flower on which to sit and wait for her prey, there unfolds a cascade of lifetime fitness variables that determine her evolutionary success. Did she choose a flower that attracts suitable prey? Will she encounter a competitor or predator? Will she survive long enough to breed, and will her offspring contribute to the gene pool? Ecologists had previously identified variables that shape...