Date: April 1989 (Revised June 1996)
Source: NDSU Extension Service Horticulturist
Little brown bats are common throughout most of North Dakota. They are usually considered beneficial because of their night-time feeding habit of eating insects.
Large bat populations are often associated with mature stands of trees, especially cottonwood. These large trees serve as shaded, darkened hiding places during the inactive day-time period. Bats are also found in secluded areas removed from human activity such as vacant buildings and house attics.
Bats are warm blooded mammals capable of contracting and spreading rabies.
Bats can be prevented from entering buildings by conducting an enclosure maintenance effort. Bats normally enter a building through a small crack or the corner of a gable. Unused chimneys also serve as a hiding place. The entrance exit locations can be discovered by observing the area about twilight time. It works well to use a flashlight.
After the entrance and exit holes have been located, they should be plugged just after dark when most of the bats have left the roosting shelter. Chimneys or large openings can be covered with coarse hardware cloth screen.
For future reference, you may want to obtain a copy of Extension bulletin WL-919, "Animal Damage Control Bats," which is available at your county extension office of the NDSU Extension Service.
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