Spider, an arthropod with a body length of 1-90 millimeters, is divided into two parts: the head, chest (anterior body), and abdomen (posterior body). The head, chest, and chest are covered with a carapace and a sternum. There are two pairs of appendages on the head and chest, with the first pair being a chelon limb, with chelon teeth and toxic glandular openings at the tip of the chelon teeth; The chelon limbs of the suborder Palatae move forward and backward, while those of the suborder Palatae move laterally and in opposite directions; The second pair is the tentacle, which forms a foot like structure in females and immature males, used to hold food and serve as sensory organs; But in male adult spiders, the end egments of the whiskers expand and become the junction apparatus for transporting sperm.

Spiders often feed on insects, other spiders, and polypods, and some spiders also feed on small animals. Jumping spiders have good eyesight and can dive close to capture prey within 30 centimeters, pouncing on them. Crab spiders wait for prey on flowers that are similar in color to their bodies. Ground spiders that burrow in the soil build burrows lined with silk, and the opening of the hole has a movable cover that opens at night to prey on insects passing through the hole. The funnel spider weaves a funnel web, and insects fall into the web, causing vibration; The spider itself resides within a silk tube, with a narrow end that passes through plant clumps or crevices.

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