Small, quick, and often unseen, the little brown bat (Myotis lucifugus) is a familiar sight across much of Florida. Like other bat species, they help keep insect numbers down, but their habit of roosting in buildings brings them into close contact with people, which can be problematic. For homeowners, this can mean scratching sounds in the attic or droppings along window sills, all signs that a colony may have moved in. In Florida, rules about how and when they can be removed make it essential to understand both the animal and the potential risks.
Characteristics
The little brown bat is one of the smaller bat species in the region. They typically measure about three to four inches in total length and have a wingspan of eight to 11 inches. Their fur can be light brown to reddish-brown or even dark brown, with belly fur usually a lighter shade. Females are slightly larger than males. These bats have small, rounded ears and short snouts. Little brown bats use high-frequency sounds and natural sonar also called echolocation, to locate prey and avoid collisions.
Identification
A closer look reveals some defining features of the little brown bat. For example, its fur has a polished look and consistent color across the body, usually some shade of brown. Its ears are short and rounded; when bent forward, they do not go past the nose. Another notable feature is the tail membrane, which is hairless.
These bats usually live in large groups, so if you spot several bats leaving a structure just after sunset, that could mean there is a roost close by. While they may be small, signs like guano, odor, or unfamiliar noise are easy to detect. For a positive ID, though, it’s best to call a professional to properly identify the little brown bat.
Habitat
Little brown bats are found throughout Florida. They can migrate hundreds of miles to get from summer habitats to their hibernaculum, which is the name for a roost occupied during winter months. Little brown bats tend to choose caves, trees, rocks, woodpiles, and buildings as roost sites, making it potentially dangerous for suburban homes.
Little Brown Bats in Florida
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 more typically in the northern U.S. and Florida. They are not territorial and normally live in colonies of thousands of bats. These colonies congregate at nesting sites, known as roosts, and use a system called echolocation to seek out their insect prey.
Little Brown Bat Behaviors, Threats or Dangers
They feed on insects and need to eat at least half their body weight to prevent malnutrition. Little brown bats are nocturnal, with peak activity a few hours after dusk. During hibernation, in colder months, their heart rate and body temperature drop to conserve energy, and they survive using stored fat.
These common pests can spread serious diseases, including rabies, and although they aren’t typically aggressive, they will bite if handled. If you notice a bat has made its way into your building, never approach it or attempt to handle it yourself. Always contact your local bat control experts.
Are Little Brown Bats Hard to Get Rid of?
Yes, they can be. Due to their size and ability to squeeze through tiny openings, locating all entry points is often challenging. Exclusion is the only legal removal method in Florida and must be appropriately timed to avoid disturbing flightless young. Colonies may return if their entry points are not fully sealed. Because they often gather in large numbers, removal and exclusion should be handled by professionals familiar with bat behavior and local laws.
How Many Little Brown Bats Count As An Infestation?
Even a few little brown bats roosting in attics, walls, or chimneys can be considered an infestation. A single colony may contain hundreds or thousands of bats. Since they live in groups, once one finds a good spot, others are likely to follow. If you see repeated activity or large amounts of guano, it’s time to call a technician. Our experts at Florida Pest Control use a multi-step process to humanely remove and exclude bats for long-term prevention.
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Frequently Asked Questions
Where Do Little Brown Bats Live?
They prefer dark and quiet places during the day, close to water and food sources. This includes caves, attics, trees, sheds, and other covered areas. These locations offer protection from predators and harsh weather.
What Do Little Brown Bats Eat?
Their diet is strictly insect-based. They consume large numbers of flying insects every night, including mosquitoes, midges, beetles, and mayflies, foraging over lakes, ponds, and streams where insects gather. Their diet benefits humans, as they help manage pest populations naturally.
Are Little Brown Bats Dangerous To Humans?
They may carry rabies, although it is rare. The greater risk comes from their droppings, or guano, which can harbor a fungus that causes histoplasmosis, a respiratory condition. Never handle a bat, even if it appears dead or injured, and always consult a healthcare provider if bitten or scratched.
Do Little Brown Bats Hibernate?
Little brown bats hibernate in cold weather to conserve energy. They look for places where temperatures remain stable and above freezing, such as caves, tunnels, or quiet parts of buildings. Disturbing bat hibernation can be harmful and may cause them to deplete their energy reserves too early.
What Is Guano, And Why Is It A Concern?
Guano is the term for bat droppings. It accumulates under roosts, especially in attics or wall voids, and emits a pungent smell. Guano can grow mold spores that may become airborne and affect air quality. These spores can trigger allergic reactions or respiratory illnesses like histoplasmosis. Guano also damages insulation and drywall, leading to costly repairs.
