Neuropterida contains the orders Neuroptera, Megaloptera and Raphidioptera. Perhaps the most well-known are the antlions, whose larvae make conical depressions in sandy soil, and lace wings, whose larvae often carry detritus on their backs as camouflage. All members of this group are predatory and some, such as the green lacewings, are important predators of aphids in both larval and adult stages. Some species, such as Dobsonflies and fishflies can be very large and are attracted to lights. Male dobsonflies have elongated mandibles, but despite their fearsome appearance, these insects are harmless to humans.