If you have problems with mosquitoes, install this bat house to encourage bats to live nearby. Bats sleep during the day and emerge at night to eat bugs such as mosquitoes, moths, flies, and gnats. Unless you stay up and watch, you might never even see the bats. The ultimate in low-impact, non-toxic pest control, bats are a great way of reducing your insect population in a natural way. No chemicals or noisy bug zappers necessary.