Insects employ tricky and highly effective survival strategies: Land bugs defend themselves by shooting precise, poisonous secretion when attacked. Even fish are immobilized by great diving beetles’ “knockout drops.” Irritated swallowtail caterpillars quickly extend their osmeterium while at the same time releasing a stinking butyric acid odor. Bombardier beetles shoot attackers with a jet of hot water vapor and a foul-smelling gas mixture from their abdomen.