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Spiders, as part of the Arachnids species and the Araneae order, are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They belong to the class Arachnida within the phylum Arthropoda, under the animal kingdom. Spiders can be found worldwide on every continent except Antarctica. Spiders are known for their ability to spin webs to catch prey, although not all species do so. Some spiders hunt their prey by ambushing it, while others burrow into the ground and wait for prey to come to them. Spider silk is a highly versatile material that can be used for various purposes such as making egg sacs or draglines. Spiders have two main body parts, the cephalothorax, and the abdomen. The cephalothorax contains the spider's eyes, mouthparts, and legs, while the abdomen houses the reproductive and digestive organs. Spiders can vary greatly in size, from tiny species that are less than a millimeter long to large ones that can reach several inches in length. Spiders play an essential role in controlling insect populations and maintaining ecological balance. While some spider species are harmful to humans, most pose no threat and may even be beneficial by helping to control pests. Understanding the biology and behavior of spiders is crucial for their conservation and management, particularly given the decline of many spider populations due to habitat loss and other environmental factors.