When the grasshopper nymph matures into an adult and gains its wings, it will stridulate, i.e. rub the herringbone ridges on its leg against the forewing to produce its calls.

These little nymphs don’t have the forewings required to make a racket; could that be why I think the kiddie grasshoppers look cooler than the adults? /Grasshopper snark. Actually, thanks to Piotr Naskrecki’s The Smaller Majority website, I have a much greater appreciation for Orthoptera stridulations, even if they are perhaps not always my favorite sounds.