The yellowjacket has a yellow coat to warn other animals that it is dangerous and should stay away. It is bold and aggressive, and if provoked, it can sting repeatedly and painfully. The German yellowjacket builds its nests in cavities (not necessarily underground) with the peak worker population in temperate areas between 1,000 and 3,000 individuals between May to August, each colony producing several thousand new reproductives after this point, through November. The Eastern yellowjacket builds its nests underground, also with the peak worker population between 1,000 and 3,000 individuals similar to the German yellowjacket. Nests are built entirely of wood fiber (usually weathered or dead) and are completely enclosed (football or soccer-ball shaped) except for a small opening (entrance) at the bottom. The color of the paper is highly dependent on the source of the wood fibers used. The nests contain multiple, horizontal tiers of combs (10 or more) within. Larvae hang down in combs.
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