Bats are classified as a pest species due to their proclivity to seek indoor shelter such as in the chimney or attic, according to the Professional Wildlife Removal website. The big brown bat, little brown bat and the Mexican free-tail bat are the most common nuisance bat species in the U.S. Practices that remove bats from a building often include limiting their access to areas of shelter.
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Single Bat Removal
Single bats occasionally enter a home inadvertently through windows or doors. Provided the bat has not scratched or bitten anyone, isolate it in one unlit room and open a window to allow the bat a clear path to the outdoors. Air currents generally direct the bat outdoors through the exit you provide. If this doesn't work, put on protective leather gloves and try to capture the bat with a coffee can, net or other container after it lands. After trapping the bat slide a stiff piece of cardboard over the opening and release the bat outdoors. If the bat appears to be injured or sick, do not release it. Call the county health authorities so the bat can be tested.
The most successful method of removal for a colony of bats is permanent exclusion, according to the Minnesota Department of Natural Resources website. Locate exterior entry points of the bats such as louvre fans, exhaust vents, air intakes, chimneys or openings around plumbing and power or cable lines. Bats access holes as little as 3/8 inch around or spaces measuring only 3/8 by 7/8 inches. Use weather stripping, caulk, insulation materials, steelwool, and screening or even duct tape to seal off the entry point. Leave the most frequented entry point open. Drape structural grade bird or bat netting over this entry point, leaving the bottom open so the bats can exit. The netting will prevent them from re-entering.
No effective or registered bat repellent is available as of 2010, according to the Professional Wildlife Removal website. Although Rozol and DDT were used in the past, they were illegal as of 2010. Most methods of repellent bat control fail as it does not address the issue of keeping bats from re-entering the domicile.
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