Esschert Design Bat house
A single bat can eat up to 1,000 mosquitoes in one hour!  Bats like to nest in warm, tight places, and you can keep them nearby by providing a nice bat house such as this.  Bat houses should be placed where they receive six hours of morning sun, and are 10 - 15 feet off the ground.  The best time to install a bat house is either late winter or early spring, but they can be installed at any time.