The most effective insect control known is bats. Bats are highly adapted for this task. Most bats use an advanced high frequency sound pulse known as echolocation. Bats are believed to calculate the time its takes for these pulses to bounce off the target object and return to track prey and navigate in dark caves or dim night skies. Most people believe that bats are blind, which is untrue.
All bats have eyes and see very well.
Megachiropterans, also known as flying foxes, do not echolocate and can see very well due to their large eyes. Microchiropterans, which echolocate very well, have eyes even though they may be very small ones. Throughout the world, bats are major predators of night-flying insects. These insects include mosquitoes and numerous crop pests. Individual mouse-eared bats, the most widely distributed bat species in North America, can catch up to 600 mosquitoes in an hour.