Yellow jackets typically nest in the ground, although rotten logs and other places are often used.
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A few years ago, one of the guys I work with was walking across the lawn inside the prison, checking things out at the end of the day. When he stepped across a nest of Yellow Jackets, they decided to attack him up his pants leg. To save himself, he pulled his pants off and began stamping on the pants. Right about then he looks up and notices that one of the bosses was giving a tour to about 30 visitors. /forums/images/graemlins/laugh.gif