Why Do some bugs Stink?

To protect themselves from their enemies. When a stinkbug is attacked it sprays liquid from holes in its body. The liquid turns into a mist that smells terrible. When other insects breathe in the mist their bodies begin to shiver and shake. Stinkbugs produce an odor so revolting it is hard to describe. The smell comes from a gland that secretes a liquid. Sprayed out through holes located where the middle legs join the body, the liquid becomes a mist with a foul smell that drives away enemies. The smell has no effect, however, in some attackers such as praying mantises, chickens or frogs. One kind of stinkbug, which lay its eggs on cedar and other needles, uses the spray to protect the larvae. And some of the bugs found living in colonies on arrowroot leaves use their smelly spray to warn other members of the colony of an attack.