think they do a cricket-ish thing rubbing wings together. they're using the hole as a horn bell for focus and tone. i think (i watch carpenter bees). ultrasoun

think they do a cricket-ish thing rubbing wings together. they're using the hole as a horn bell for focus and tone. i think (i watch carpenter bees). ultrasound for body range communication will probably be subject to much interference and attenuation; i think radio will be easier.