Paper wasps (Yellowjackets and Hornets) are the insects that make these nests. The nest grows quickly during the spring and early summer as the colony grows and several generations of workers are produced. At the end of summer, the queen produces eggs that will develop into the males and females that will leave the nest to mate and start the process over the next year. When these reproductive wasps leave, the life of the colony is essentially over, the few workers left behind donít mount a resistance when the Jays and/or Crows move in to eat the few remaining larvae and pupae. It seems the Jays and Crows know exactly when they can move in and have access to the protein rich wasp babies without getting attacked. The same thing happens to those paper wasps that nest underground, foxes, coyotes and skunks dig up the nests when the season ends.