BATS 101

Sharing What We’ve Learned About Bats


Bats are fascinating creatures and deserve to be understood.

There are upsides to bats as well as downsides.  The following will discuss some of these aspects.

Eight species of bats can be  found in Minnesota.  Four species (Little Brown Bat, Northern Long Ear, Big Brown Bat, and Eastern Pipistrelle) form colonies and can be found in groups.  Hibernacula for these include caves, hollow trees, and buildings. These animals typically feed over open fields, along woodland edges, or over lakes and streams. The little brown bat and the big brown bat are most typically the bat species we find infesting structures in Minnesota.

The remaining four types (Silver-haired Bat, Red Bat, the Evening Bat, and Hoary Bat) are commonly called tree bats; their preferred habitat. They lead solitary lives, characteristically roosting in trees and feeding in or around forested areas.

Fast Facts: Little Brown Bats

little brown bats

Females gather with the same nursing colony every year.

Pups are born in June-July.

Birth one pup per year.

Mothers can fly with their young attacher to their nipple and nurse for 3 weeks.

Prefer roost sites with stable ambient temperatures and cluster together when roosting.

Life span may approach 30 years of age.

Typically hibernates from September – March(northern range).

Vast population decline due to white nose syndrome.

Weighs between 0.4 and 0.6 oz.

Pups born late may-June.

Birth two pups one time per year.

Pups can fly (volant) in 3-5 weeks.

Tend to live solitary or in small groups.

Take a break to let food digest as they feed at night.  This night roost break behavior is the reason we see bat guano on porches, decks, sidewalks…

Can be active during winter. Known to change hibernacula at temps below 32 degrees!

Life span may approach 20 years of age.

Fast Facts: Big Brown Bats

Bats: Pros and Cons

We are Here To Help!

How to Safely Remove Bats from Your Home

If a bat were to get into my house, how would I safely remove it?

Wearing GLOVES, use a container to capture the bat as illustrated above. Do not touch the bat with your bare hands or try to hit it with an object such as a tennis racket.

Why should you never touch a bat with bare hands?

Bats groom themselves by licking their fur.  Rabies is found in the saliva of the animal.  If you touch a rabid bat who just groomed itself, the rabies can transfer into your system through micro cuts found in the skin on your hands.

Why should you never hit a bat with a tennis racket?

If a bat is hit with a tennis racket, the saliva found on the bats fur due to grooming can be aerosolized and contracted.

For more information on capturing a bat visit the DNR website or the CDC site below:

More About Bats

Bat Bugs, Alternate Nesting Structures, and Bat Entry Points

Bat Bugs
Bat Bugs
Bat Free LLC has had customers express the sentiments that if the bats stay in the attic there is little danger with regard to any effect on the living space. Sadly this is not true. In addition to the potential for rabies, histoplasmosis, and unpleasant odors, bats carry ectoparasites, such as bat bugs and bat ticks. These “lice” may enter the living space of a structure in search of an alternate host. Once allowed to become established, this parasite will require structural pest control (pesticide application) to eradicate.
Bat Houses
Bat Houses
Bat houses have their place but provide only temporary habitation for bats. They are primarily used by bats on the hottest nights of summer. Overnight temperatures must be sufficiently warm to support this kind of roosting site. On cooler nights bats return to their primary hibernaculum.
Bats cannot winter in these structures as they cannot produce sufficient body heat to prevent freezing solid. Bats are extremely susceptible to hypothermia and death due to exposure!
Bat houses DO NOT keep bats from infesting near by structures. The only permanent solution is getting your home bat proofed by a NWCOA qualified technician!
Access Points
Access Points
Bats need an opening as small as ¼ inch x1 inch to enter a structure. Chewing animals such as squirrels can create openings in sofit and fascia materials, in addition animals such as woodpeckers can bore holes in siding sofit and fascia that bats can use to enter the structure. However, post construction related openings account for the vast majority of bat entry points year in and year out. Deflection in the structure due to aging materials, poor workmanship, A new roof due to hail, repair from fire damage or ice dam issues, wind damage.

At Bat Free LLC we inspect siding, windows, soffit, fascia, venting, chimneys, flashing, valleys, roof lines…and more.  We know where and how to let the currently roosted bats get out, as well as where and how to seal to prevent their re-entry.  Bat Free LLC strives to keep the overall visability of our work to a minimum.  We do not use spray foam as a component in the bat proofing process.

Get in touch

805 Pineview Ln N
Plymouth, MN 55441
Phone: (612) 323-5313

Email: batfreemn @

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