Several lepidopteran families include species whose larvae bear urticating hairs. Insect resistant crops target various species of coleopteran (beetles) and lepidopteran (moths). The larvae of many lepidopteran species are major pests in agriculture. The bacterium produces proteins that, when ingested, kill lepidopteran caterpillars. The larvae of sawflies are easily mistaken for lepidopteran larvae (caterpillars). Indoxacarb is an oxadiazine pesticide developed by DuPont that acts against lepidopteran larvae. Sawfly larvae behave like lepidopteran larvae, walking about and eating foliage. During sporulation, Btk produces a crystal protein that is lethal to lepidopteran larvae. "Cassia" species are used as food plants by the caterpillars of many lepidopteran taxa. Both lepidopteran and symphytan larvae have eruciform body shapes. Baculovirus is a virus common among lepidopteran insects. A large number of lepidopteran insects feed on birch foliage. A few genera have normal lepidopteran wings. "Trichogramma" spp. have been used for control of lepidopteran pests for many years. The Hepialidae are a family of insects in the lepidopteran order.