Arachnids attack and kill small animals, especially insects and their relatives, and then feed on their body fluids. Many ticks and mites are parasites, meaning that they feed on the blood and tissue fluids of their victims without necessarily killing them. Some mites take the fluids and tissues of plants and funguses. Unable to chew, most arachnids must first digest their food outside their bodies. They pierce tissues with their mouthparts and inject them with digestive chemicals, turning them into fluids. The fluids are then sucked through the mouth and into the body.

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