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Harvestman (order Opiliones) carrying red parasitic larval mites (family Erythraeidae). Members of the arachnid family, harvestmen 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. Erythraeidae mite larvae feed on the body fluids of the harvestman and other arthropods, but the adult mites are free-living predators. (KEYSTONE/SCIENCE PHOTO LIBRARY/NIGEL DOWNER/SCIENCE PHOTO LIBRARY)