Little Brown Bat

Category:

Actual Size:  3–4” total length with a wingspan of 8–11”

Characteristics: Small mouse-eared bats with a variety of fur colors possible and usually lighter color belly fur. They have a short snout and females are larger than males.

Habitat: Usually found in forests, along lakes, and rivers. They use buildings to roost occasionally.

Habits:

  • Have a lifespan of about 6.5 years
  • Nocturnal creatures that forage for insect prey at night
  • During the day, they roost in hollow trees or buildings

Little Brown Bats in Puerto Rico

True to their name, little brown bats weigh less than half an ounce and are one of the smallest types of bats. They are found in many places, but enjoy high-elevation areas and forests in our area. They are not territorial and tend to live in colonies of thousands of bats. These colonies congregate at nesting sites (known as roosts). These bats use a system called echolocation to seek out their insect prey.

Little Brown Bat Habitat

Little brown bats are found throughout the nation. They can migrate hundreds of miles to get from summer habitats to their hibernacula, which is a roost occupied in the winter months. Little brown bats tend to choose caves, trees, rocks, and wood piles as roost sites. Occasionally, little brown bats will choose and buildings as roost sites, making it potentially dangerous for suburban homes in the San Juan and Ponce neighborhoods.

Little Brown Bat Behaviors, Threats or Dangers

Little brown bats feed on insects. They use a process called echolocation, which is similar to the sonar used on ships, to determine the location and size of their prey. These bats need to eat at least half their body weight in insects to prevent becoming malnourished. Little brown bats are nocturnal and their peak activity is a few hours after dusk. Little brown bats are known to roost in buildings, making it important to know how to prevent them. Bats can spread diseases including rabies. They aren’t typically aggressive but will bite if handled. If you notice little brown bat roosts or activity near your property, it’s best to call your local wildlife control experts.