What is a common trait of earwigs concerning their wings?

The correct answer highlights the unique wing structure of earwigs. Earwigs possess membranous rear wings that are intricately folded beneath their front wings when at rest. This folding mechanism allows for effective protection of the delicate rear wings and is a characteristic feature of this order of insects, known as Dermaptera. The front wings are hardened and serve to cover the rear wings, which play a crucial role in flight when fully extended.

In contrast, while some other insects completely lack wings or have a different wing configuration, earwigs specifically exhibit this distinctive folding behavior of their wings, making the choice that states the rear wings are folded under the front wings the most accurate descriptor of their wing physiology. The other options do not correctly capture this structural aspect of earwig anatomy, underscoring the importance of understanding insect wing morphology.