Although the most familiar type of spider web is called an "orb" web, some spiders make horizontal "funnel" webs in moist, sheltered places, such as under a rock or fallen tree. Underneath the flat sheet of web is a sequence of funnels that lead to a hole where the spider is concealed. When an insect strolls out onto the web's smooth surface, the spider senses the vibrations, emerges from the hole, bites the insect, and drags its meal back into the hole. Funnel webs are very durable, and spiders that construct them often build them for years. From the passage above, it can be inferred that