http://youtu.be/0tWo7vcPYuQ
Wasps are predators, feeding insects to their young. What makes them beneficial is that they prey on many insects, including caterpillars, flies, crickets and other pests. What makes them a pest is in late summer and fall they alter their tastes and go after sweets. Wasps should only be controlled when they become a problem. Otherwise, it is best way to tolerate them.
Wasps have a slender body with a narrow waist, slender, cylindrical legs, and appear smoothed-skinned and shiny. Yellow jackets, black jackets, and paper wasps are the most common types of aggressive pests encountered by people.