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Spiders (order Araneae) are air-breathing arthropods characterized by their eight legs, chelicerae with fangs that can inject venom, and spinnerets that produce silk. They are classified as arachnids and differ from insects by having two body segments instead of three and eight legs instead of six. There are over 46,700 species of spiders, which vary greatly in size, color, and habitat. Spiders play a crucial role in ecosystems as predators, helping to control insect populations.