But then there are yellow jackets (Vespula spp), which become aggressive ... solitary wasps are not aggressive and don’t ...

A high school teacher trying to solve the mystery of why queen Vespula wasps mate with many different males thinks the practice might have evolved to stave off a catastrophic colony collapse.

Their stings are painful, but the wasps are usually not aggressive except when disturbed at the nest. German wasps (Vespula germanica) are very similar in appearance to the yellow-jacket ...