Big Brown Bat Control: Protect Your Home


What Do Big Brown Bats Look Like?
Size: The bats have wingspans ranging over a foot in length, topping out at around 16 inches. Despite their relatively large size, adult big brown bats weigh one ounce or less.

Color: Dark skin and glossy brown fur helps the bats blend in to the black of night.

Characteristics: Bats are the only mammals truly capable of flight and they have large webbed wings. Big brown bats also have short ears, small eyes, and broad snouts.

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  • Species: Big brown bats are one of the largest North American microbats.
  • Sightings: The mammals are commonly sighted at dusk when they emerge from their daytime roosts to hunt for insects.
  • Role: They play an important role in the ecosystem by keeping insect populations from growing too large.


What Do Big Brown Bats Eat?
As with most types of North American bats, big brown bats are insectivorous.

They mainly prey upon beetles but will also consume other kinds of flying insects, like:


Colonies of big brown bats often contain hundreds of the creatures and can be found in dark, secluded places like caves, bridges, or even abandoned buildings.

Under healthy conditions, they live for over 20 years in the wild.

Life Cycle
Young bats that are born in the spring stay with their mothers for several months and begin learning how to fly when they are about 5 weeks old.


  • Flying: May spot bats at dusk flying over open spaces like fields, marshes, and backyards as they hunt for insects.
  • Smudges: Look for smudge marks under roof eaves, on siding, or on interior walls from their oily fur.
  • Feces: Be alert for bat droppings on the ground or exterior walls.
  • Sounds: May hear squeaking sounds from young bats communicating with their mothers.

Problems Caused by Big Brown Bats

Accumulations of bat droppings are serious health hazards.

Bat Guano
Nutrient-rich guano promotes the growth of dangerous fungi, such as histoplasmosis, which can cause life-threatening respiratory disease in humans.

As piles of droppings grow in attics, ceilings may start to sag and even collapse given enough time.

Bats themselves also act as vectors for insect pests and parasites and are capable of transmitting rabies to humans.

Signs of Infestation

Potential signs of a big brown bat infestation include:

  • Seeing bat guano.
  • Hearing rustling in the attic.
  • Spotting smudge marks on the walls.
  • Seeing big brown bats hunting outside near the home.

While the presence of bats can benefit the local ecosystem and rid the nearby area of flying insect pests, roosting in homes only leads to problems.

Prevention Tips

  • Exclusion: Seal up all potential entrances to attics and cover unused chimneys.
  • Bird Spikes: Attaching bird spikes to the underside of roof overhangs may prevent the animals from roosting near homes, as well.
  • Food Sources: The presence of big brown bats can also be deterred by taking steps to curb insect populations, thereby eliminating potential food sources.

Tips for Removal from Home

Residents should never attempt to handle or remove big brown bats without professional assistance.

Since a bat bite can cause rabies if the animal is infected and their droppings may cause respiratory illness, reckless handling can be fatal.

Contact the Experts
Bat removal is better left to the animal control experts at Western Pest, who are trained and equipped to safely eradicate unwanted infestations.

Learn more about Western’s comprehensive Home Pest Control Plans.

Call for service: (877) 250-3857