Assassin bugs, like all true bugs, have piercing-sucking mouthparts, or beak, for stabbing and then sucking out the body contents of their prey, usually other insects, which make them beneficial. They are rather common, and some species can be found in our homes. Many of these can inflict a painful bite if handled carelessly. A few assassin bugs are blood feeders, including on humans, though the bites of these species are typically painless. Some of these species are important transmitters of disease, not necessarily through the bite, but from micro-organisms that are in the feces that get into our bodies through broken skin.