Build, fly, pollinate! What striped insect does all this? It is not a bee. It's a yellowjacket! How big are yellowjackets? What do they eat? Why do they sting? In All About North American Yellowjackets, meet these hardworking wasps that build nests up high in trees and down low in the ground. They do the important jobs of controlling pests and spreading pollen so that crops and gardens can grow.