Wasp nests in Australia are usually grey and papery or umbrella-shaped, often found in roof voids, wall cavities, trees, sheds, or underground. Social species like the European Wasp can become highly aggressive if their nest is disturbed and may sting multiple times. Large nests pose risks to children, pets, and anyone allergic to stings. Because of the danger of swarming attacks, safe removal by licensed pest control professionals is strongly recommended.