True bugs take liquid food from plants or animals. Some suck plant sap, others dissolve seeds, some sip out the juice from cells in the leaves. Many true bugs are predators, stabbing their prey (usually other Insecta, sometimes other animals including vertebrates, like Mammalia and Aves, Gastropoda, or Aranaea) and sucking out their blood or body fluids. For example, stink bugs feed on Lepidoptera and some aquatic bugs feed on Cuculidae larvae. Bed bugs are a parasitic member of the true bug group -- the feed on mammal blood, including humans.
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