why are they called stink bugs

They are called stink bugs because they produce a strong, unpleasant odor as a defense mechanism when threatened or crushed. This odor comes from chemicals produced in glands located in their abdomen. The smell can vary by species and has been described as resembling strong herbs and spices like cilantro and coriander. The purpose of this smell is to deter predators and protect the stink bugs from harm. This defensive chemical spray can sometimes be released several inches away from the bug. The name "stink bug" reflects this characteristic feature of emitting a pungent smell when disturbed or under threat.