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Harvestman eating a mushroom. Harvestmen (order Opiliones) are arachnids but are distinct from spiders in that they have only one body section as opposed to two. They are omnivorous and eat a wide range of foods including dead matter, fruit and small insects. They secrete a foul smelling liquid as a defence mechanism. (KEYSTONE/SCIENCE PHOTO LIBRARY/MELVYN YEO/SCIENCE PHOTO LIBRARY)