Paper wasps are boldly colored in black and yellow, more readily identifiable by their open-celled nests then by the wasps themselves, which look very similar to yellow jackets. These wasps are one of the more significant insect threats to humans, though they are generally not as aggressive as yellow jackets. If disturbed, these wasps can sting multiple times, and their venom can cause serious allergic reactions in some people.
Paper wasps are very common in western Washington. They build the distinctive papery nests with open cells, and are frequently found under overhangs, on support beams, and the sides of buildings. In nature, wasps serve as a form of organic pest control, hunting other insects and frequently undesirable pests near homes and gardens. Despite this value, wasps are often considered pests due to their ability to sting and similarity to more aggressive insects.