| European wasps are roughly the same size and general shape as honeybees, but easily distinguished by their bright yellow and black markings. They build large nests, usually hidden underground or in a cavity. They are quite aggressive when disturbed, and multiple stings are common. They pose a serious threat to humans, and colonies found near buildings or walkways should be professionally exterminated. A single wasp away from the nest poses less of a threat and is likely to refrain from aggressive behaviour if left unmolested. |  Photo: R. Lowe, AVRU |