Mecopterans eat both plant and animal tissues. The adults and larvae of scorpionflies scavenge mostly dead insects. The adults are known to steal insects trapped in spider webs. They also feed on pollen, nectar, and fruit juice. Adult hangingflies are predators (PREH-duh-ters) or hunters and seize aphids, caterpillars, flies, moths, and sometimes spiders with their hind feet. Their larvae eat mostly dead insects and some decaying parts of plants. Adults and larvae of snow scorpionflies eat mosses. Short-faced scorpionfly adults graze the surfaces of leaves, but it is not known what their larvae eat. Aquatic scorpionfly larvae feed on the aquatic larvae of flies (Diptera) known as midges, but the diet of the adults is unknown.

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