I'm thinking of an activity for 5th graders that involves trying to figure out a way to fold an insect wing so it fits under a wing-cover or elytra.
We could learn about the different ways that insects fold their wings (and how cool earwigs are) but also I think there could be some geometry in this too.
Each student would get a pattern for the unfolded wing and the cover that corresponds to it. Then try to fold it up so that it fits, then compare to how nature did it.