What is a key identifying feature of Paper Wasps?

Paper wasps are known for their distinctive nests, which are constructed from wood pulp. These nests are created through a unique process where the wasps chew wood fibers, mixing them with saliva to create a material that resembles paper. This construction technique is a giveaway when identifying paper wasps, as their nests typically appear as open, umbrella-shaped structures.

In contrast, the other options do not accurately represent key characteristics of paper wasps. For example, while some wasp species may have the capability to reproduce under varying conditions, paper wasps do not necessarily breed year-round. Additionally, paper wasps possess stingers and can defend their nests if they feel threatened, making the claim that they have no stingers incorrect. Lastly, paper wasps are social insects that live in colonies, rather than being solitary insects, which is a significant aspect of their behavior and lifestyle.