What physical feature distinguishes paper wasps from other wasps?

The physical feature that distinguishes paper wasps from other wasps is their umbrella-shaped nest. Paper wasps are known for constructing distinctive nests that are open and flat, resembling an umbrella or a honeycomb structure. This nest design is made from paper-like material that the wasps create by mixing plant fibers with their saliva, making it different from the more enclosed nests of many other wasp species.

The other choices refer to characteristics that either overlap with other insects or do not specifically identify paper wasps. For example, red coloration does not uniquely identify paper wasps as they can come in various colors, including brownish or yellowish tones, depending on the species. Black and yellow stripes are also common across many wasp species and are not exclusive to paper wasps. Large size can vary significantly among the many types of wasps, thus not providing a definitive way to distinguish paper wasps from others. The unique shape and structure of their nests are the primary identifiers for paper wasps.