 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.The spider detects the prey by vibrations and, when it comes close enough, leaps out of its burrow to make the capture.Some "Conothele" species do not build a burrow, but construct a silken tube with trapdoor in bark crevices.