Vespidae is a highly predacious family that holds wasps and hornets. These insects are characterised by their narrow waists and their wings which fold longitudinally in half when at rest. The family displays a spectrum of social behaviour; some groups are strictly solitary, but the vast majority are social, with many species that fall somewhere in between. The typical structure of a social nest will involve a queen, workers and drones (male wasps). The workers possess modified egg-laying tubes, or ovipositors, repurposed for stinging and defending the nest from predators. Vespula species are commonly called yellow jackets after their striking yellow and black colouring.