Bolas spiders are defined by the way in which adults catch their prey. Like other members of the subfamily Cyrtarachninae "sensu lato", bolas spiders specialize in catching moths. The scales covering moth wings are detachable, so that most ordinary orb webs are not effective at capturing moths. Adult female bolas spiders spend the day resting, disguised in various ways, including as bird droppings. At night, they feed on male moths which they attract by producing a scent that mimics the sex pheromones emitted by the female of one or more species of moth. They capture approaching male moths by using a "bolas", a silken thread with one or more sticky drops at the end which they swing, rather than throw, at the moth. Other spiders in the subfamily Cyrtarachninae, including "Celaenia" species from Australia and "Taczanowskia" species from South America, also use chemical lures to attract moths, but they catch them with their front legs.