An 'I see you' prey-predator signal between the Asian honeybee, Apis cerana, and the hornet, Vespa velutina

► Theory suggests that signals between prey and predator can coevolve. ► The prey avoids attack, the predator avoids chasing a prey that has been alerted. ► Examples of convincing prey-predator signals are rare especially from insects. ► We report a predator-prey signal from a honeybee and its hornet predator.