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Chrysopa perla is a species of insect in the family Chrysopidae. Present in most of Europe and in temperate zones of Asia, these insects prefer cool and shady areas. They may reach 10–12 millimetres (0.39–0.47 in) in length, with a wingspan of 25–30 millimetres (0.98–1.18 in).Photograph: Mathias Krumbholz