It is also the only true hornet (genus Vespa) found in North America, having been introduced by European settlers in the 1800s.[1][2] V. crabro is usually regarded as a pest by those humans who come into contact with it.[3] Vespines, like V. crabro, are known for making intricate paper-like nests out of surrounding plant materials and other fibers.[4] Unlike most other vespines, reproductive suppression involves worker policing instead of queen pheromone control, as was previously thought.