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Big Brown Bat


Actual Size: Body length of 4-5”, with a wingspan of 12-13”

Characteristics: Copper-colored fur with lighter belly fur. Small round ears that are black in color. Broad nose and black wings.

Habitat: Thrives in various environments, including deserts, meadows, urban areas, forests, and mountains. Can be found hibernating in caves and building structures.


  • Primarily nocturnal, foraging for insects like moths, beetles, and other flying insects.
  • Often found in buildings, attics, behind shutters, and beneath loose tree bark.
  • Seeks shelter in caves, mines, and structures during the winter months.
  • Typically give birth to one or two pups in early summer.
  • Relies on echolocation to navigate and locate prey during flight.

Big Brown Bat

Big Brown Bats in Atlanta, GA

The big brown bat, a larger bat species, is notably widespread across Atlanta, GA, thriving in urban and suburban settings as well as wooded areas. They have shown resilience in environments that other bat species might struggle with. Their diet primarily consists of beetles, using their strong jaws to penetrate the beetles’ tough exoskeleton. Additionally, they consume moths, flies, wasps, and flying ants. Colonies usually range from 20 to 300 individuals, and these bats have the potential for a lengthy lifespan in the wild. However, many succumb to malnutrition during their initial winter hibernation, resulting in early mortality.

Big Brown Bat Habitat

Big brown bats display a diverse habitat range, inhabiting meadows, deserts, mountains, forests, suburbs, and cities. When it’s time for hibernation in November, they seek caves, mines, walls, attics, or other buildings, typically within around 50 miles of their summer roosts. During hibernation, they cluster in small groups and emerge in the springtime.

Big Brown Bat Behaviors, Threats, or Dangers

The big brown bat, primarily active at night, seeks various roosts during the daytime. While they consume diverse insects, they have a preference for beetles and are valuable in controlling agricultural pests. Their lifespan typically exceeds 6 years. However, their tendency to roost and hibernate within buildings poses a significant concern. During winter, they might seek warmth in attics or walls within homes and structures. These bats can carry diseases, warranting extreme caution if encountered. Should you find a bat in your building, avoid approaching or handling it and seek assistance from a professional pest control company.