Wasps are fierce defenders of their nests, using painful stings to ward off intruders. They come in a wide range of shapes and colors and differ from bees in their smooth bodies. Wasps measure from 1/2 to 3/4 inch long and are predators who seek out and scavenge for protein to eat such as spiders, insects and small animals.
Some species of Wasps are solitary, while others will grow a colony numbering in the thousands. A nest is started with one queen who lays the eggs for the entire colony. If the queen dies, a worker bee can assume the egg laying role until an new queen is produced.
Almost every pest insect species has at least one wasp species that preys upon it, making wasps critically important in natural control of their numbers, or natural biocontrol. Parasitic wasps are increasingly used in agricultural pest control as they prey mostly on pest insects and have little impact on crops. (Factoid Source: wikipedia)