During hot summer evenings after the cicadas have finished their daylight cacophony, a new sound is heard from beneath the ground. This sound, at about 200 pulses per second, is the mating call of the mole cricket. They are robust brown insects with their front legs developed into efficient digging implement. Watering the ground will sometimes trigger vocal activity.
Their serenade starts about 7 pm and usually lasts for an hour or so.