Wasps are considered pests when they become excessively common, or nest close to buildings.
People are most often stung in late summer, when wasp colonies stop breeding new workers; the existing workers search for sugary foods and are more likely to come into contact with humans, If people then respond aggressively, the wasps sting.
Wasp nests made in or near houses, such as in roof spaces, can present a danger as the wasps may sting if people come close to them. Stings are usually painful rather than dangerous, but in rare cases, people may suffer life-threatening.
Wasp bodies have pointed lower abdomens and a petiole, a narrow waist that separated the abdomen from the thorax. In appearance, they are much thinner than bees.