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Arachnids are a group of eight-legged invertebrate animals belonging to the class Arachnida, which also includes spiders, scorpions, mites, and ticks. They are characterized by their segmented bodies with two main divisions: the cephalothorax (fused head and thorax) and the abdomen. Most arachnids have simple eyes and lack antennae or wings. Arachnids are not typically kept as pets, but some species such as tarantulas and certain types of scorpions can be found in captivity. They play a crucial role in maintaining ecological balance by controlling pests and contributing to the decomposition process. While arachnids share some similarities with horses, they are not related to them as horses belong to the class Mammalia. However, both arachnids and horses have an important place in their respective ecosystems and contribute significantly to biodiversity.