In insects, organs that produce sound when
rubbed together. Crickets rub their wings
together, but grasshoppers rub a hind leg
against a wing. Stridulation is thought to be
used for attracting mates, but may also serve
to mark territory. Temperatures can be
determined from the stridulations of
crickets: adding 40 to the number of chirps
counted in 15 seconds gives the approximate
temperature in Fahrenheit.