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Learning How to draw a trapdoor spider - Aprendiendo Como dibujar una araña minera Ctenizidae is a family of medium-sized mygalomorph spiders that construct burrows with a cork-like trapdoor made of soil, vegetation and silk. They may be called trapdoor spiders, as are similar species, such as those of the families Liphistiidae, Barychelidae, Cyrtaucheniidae and some species in Idiopidae and Nemesiidae. Some Conothele species do not build a burrow, but construct a silken tube with trapdoor in bark crevices. The trapdoor is difficult to see when it is closed because the plant and soil materials effectively camouflage it. The trapdoor is hinged on one side with silk. The spiders, which are usually nocturnal, typically wait for prey while holding on to the underside of the door with the claws on their tarsi. Prey is captured when insects, other arthropods, or small vertebrates disturb the ’trip’ lines the spider lays out around its trapdoor, alerting the spider to a meal within reach.