Common Pest Wasps usually choose a warm sheltered spot; on trees, a fence, wall or in a bank or under the eaves. Wasp Nests can be huge with several hundred or thousand wasps, all with a sting, to a nest. The Paper Wasp forms slightly smaller open nests. Stings can be nasty and can cause anaphylactic shocks to those allergic to the stings in which seeking medical advice is important. Caution should always be taken when tackling the nests.