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The crabpot is a large square trap constructed out of galvanized chicken wire (some new pots are constructed out of PVC (polyvinyl chloride) coated wire. The trap has two internal chambers. The bottom chamber, or "downstairs", consists of two or four entrance funnels, known as "throats", which allow the crab to easily enter but not exit. In the center of the bottom chamber is the "bait box" which is constructed of fine-mesh galvanized wire so that the crab cannot get to the bait. The top chamber is the holding area, known as the "parlor" or "upstairs". Crabs enter the parlor through oblong, funnel-shaped, holes cut into the floor of the parlor making it difficult for the crab to swim back downstairs. Crabpots are ingenious contraptions in that they utilize the crab's very own escape instincts in order to trap them. Crabs smell the bait and circle the pot, entering through one of the throats. Once inside and unable to reach the bait, the crab feels trapped and threatened. When threatened, a crab instinctively swims up towards the surface to escape, where it winds up inside the parlor. It remains in the parlor until removed through a special opening along one of the top edges. Most crabpots have two small exit holes up high in the parlor called "cull rings". These rings are big enough to let small crabs escape yet small enough to trap the larger keepers.