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The formidable attraction potential of sex pheromones, illustrated by a single two-day catch of male rust red click beetles Elater ferrugineus at Hallands Väderö in southern Sweden. Before the use of pheromone-baited traps for E. ferrugineus, no entomologists would likely have encountered this number of adult specimens during a life-time. Each specimen in the trap has been individually marked before release, for the purpose of recapture studies. Photo: Benjamin Forsmark
