insects
On a warm summer evening, a grasshopper makes a chirpy singing sound, but it isn't using its mouth at all.
A grasshopper makes its chirping sound by rubbing its legs together, a technique scientists call stridulation, where tiny bumps on its back legs scrape against a hardened edge on its wings to create a rhythmic, buzzing chirp. This lets the grasshopper produce sound without any vocal cords or mouth movement at all.
Clapping wings and whistling through a mouth are both incorrect, since grasshoppers don't slap their wings together to make noise, and insects don't have mouths built for whistling the way people do.
Different species of grasshoppers and crickets can be told apart just by listening to the pattern and pitch of their chirps, which is a trick that scientists studying insects actually use in the field.
insects
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