Playing dead is a favoured ployJanet Ridley/Alamy Stock PhotoBy Sandrine CeurstemontFemale dragonflies use an extreme tactic to get rid of unwanted suitors: they drop out the sky and then pretend to be dead. Rassim Khelifa from the University of Zurich, Switzerland, witnessed the behaviour for the first time in the moorland hawker dragonfly (Aeshna...