Bees and wasps are generally beneficial insects as they pollinate flower and vegetable gardens and feed on other insect pests. However, when they nest in or near structures, control is usually warranted. Most species of bees and wasps are social insects and build nests containing sometimes thousands of individuals. Some nest inside walls or underground, while others build paper nests suspended from trees, shrubs, overhangs, in attics or in sheds. Wasps tend to be more aggressive as summer ends and will often find their way indoors.