Nests are built underground, or in stumps, or fallen logs. Yellow jackets sting repeatedly with little provocation. Adults drink nectar, fruit juices, and possibly eat other insects. Larva feed on insects that are pre-chewed by the adults. Preferred habitat is meadows, forest edges and lawns.
Nests are large, paper like, pendulous structures suspended from tree branches.
Bald faced hornets will sting repeatedly if their nest is disturbed. Adults drink nectar and the larva feed on camel crickets and long horned grasshoppers. Preferred habitat is fields and woods. The female excavates a short burrow in the earth and places an anesthetized victim in the burrow with a single egg, and then seals the entrance. Adults drink nectar and larva feed on cicadas.