Predator-prey evolution has equipped some honey bees with a potent defense mechanism against a hornet attack. A signal from colony guard bees lets hornets know that their attack plans have been exposed, and also sends an alarm across the bee colony communicating that urgent reinforcements are needed due to the impending danger. This “I see you” (ISY) visual signal involves guard bees shaking their abdomens laterally and increases as the threat intensifies.