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Bats in your roof?

The most common species that causes problems in the Tampa Bay area is the Brazilian free-tail or Evening Bat.

Brazilian free-tail bats especially love barrel tile roofs. They roost underneath the tile.

Once in your tile roof bats can cause extensive damage. While roosting they create piles of droppings or guano. Guano makes a great fertilizer but this guano isn't treated like the stuff you get in the nursery. It is laden with disease and it piles up quickly.

Bats are extremely benificial to the community. They feed on insects and are protected.

Bats cannot be removed from your attic between April 15th and August 15th because this is their breeding season.

Having bats removed from your attic or roof is not a job for an amateur. Give us a call and we will refer a licensed professional to solve your bat problem.

Call today!







Bats of Florida

Ginger M. Allen and Martin B. Main


Nocturnal (night time) habits, affinity for eerie places, and silent, darting flight have made bats the subjects of a great deal of folklore and superstition through the years. Able to function in the dark when and where humans cannot, it is no wonder that bats have been associated with the supernatural in the past. Bats remain poorly understood even today.

The general lack of understanding of bats has contributed to alarming declines in bat populations. Some of the more important causes of these declines include destruction of habitat, harmful pesticides, and disturbance of nesting colonies. Two species of Florida bats are listed as endangered at the federal level. These include the Gray bat (Myotis grisescens), and the Indiana bat (Myotis sodalis). The Florida Mastiff bat (Eumops glaucinus floridanus) is listed as an endangered species at the state level.

Bats are highly and uniquely adapted to catch night-flying insects. They use their wings, the skin around their tails, and their mouths to catch insects in flight. Most locate their food and navigate by uttering a continuous series of ultrasonic cries that return as echoes off solid objects. This form of navigation is termed echolocation. This technique is also used by dolphins to detect prey and navigate in conditions of low visibility.

Bats are the only mammals capable of true flight. They are in the taxonomic order Chiroptera, which means hand-wing. A bat's fore limbs have the same configuration as other mammals', but the bones of the fingers are elongated to support membranous wings. The hind limbs are also modified to allow them to alight and hang, head-down, by their toes.

Bats rest during daylight hours and take shelter in a variety of places: caves, mines, buildings, rock crevices, under tree bark, and amongst foliage. Many species congregate in nursery colonies during the spring and disperse in July and August when they begin their migration to hibernation sites (usually caves).

Most Eastern species produce one young per year; several species produce two, and one produces up to four. Colony female bats group together to make a nursery before they have their young. When all of the bats are crowded together, the temperature of the nursery is raised to more than 100 degrees F. As these young bats have no fur, they need a warm and humid place to survive. Solitary or foliage-roosting bats tend to have more than one young at a time. They often possess thicker and more colorful fur than colony-roosting bats. Like other mammals, young bats are fed on milk until they are capable of foraging on their own.

Most Indiana bats that summer in the American midwest migrate south (mainly to Kentucky) to spend the winter in large caves. It is critical that a hibernation site is cool with temperatures that remain above freezing and that it is relatively free of human disturbance. If a bat is aroused from hibernation too many times, it will decrease its fat reserves to a point where it cannot survive through the winter. Generally, bats do not feed during hibernation. Indiana bats hibernate in dense clusters, in some cases literally carpeting cave walls and ceilings. The hibernation clusters can contain up to 300 bats per square foot.

Bats are an important part of the natural system. They prey upon insects, some of which are agricultural or human pests. The Little Brown Bat (Myotis lucifugus) can eat up to 600 mosquitoes an hour. A group of 150 Big Brown Bats (Eptesicus fuscus) can consume 18 million rootworms each year. Bats also consume cutworm and corn borer moths, potato beetles, and grasshopper crop pests. Cave-dwelling bats contribute nutrient-rich guano (feces) that acts as a fertilizer which supports ground-dwelling cave life. Bats are important animals in scientific research, providing insights into hibernation and sonar mechanisms.

This document discusses representative species of the bats that occur in Florida and provides a simple key for their identification.

Florida Bats

There are 18 species representing 3 families of bats in Florida. Twilight bats (family Vespertilionidae) are the best represented with 14 species. Free-tailed bats (family Molossidae) include three species. One species of leaf-nosed or New World fruit bats (family Phyllostomidae) occurs only in the Florida Keys.

Twilight and free-tailed bats that occur in eastern North America are insectivorous and can be divided into two groups: those that typically roost only in trees and those that spend at least a portion of the year in caves. When caves and forests are scarce, bats may also roost in buildings, culverts, bridges, and hollow trees. Utilizing the key characteristics other than roosting preferences, as listed in the identification key, will help in identifying bats.

Tree roosting bats are typically solitary and roost under leaves, branches, or within tree cavities to blend into their surroundings. Free-tailed bats of Florida form roosting colonies in trees and buildings. The Brazilian free-tailed bat is the only free-tailed bat commonly found throughout the state. The Jamaican fruit bat also roosts in trees and is the only member of the New World fruit bats that occur in Florida.

Some Twilight bat colony species are entirely dependent upon caves (Gray bat). Historically, caves provided safe environments with stable temperatures ideal for bat colonies. Because cave roosting bats may congregate in large numbers (hundreds of thousands) and because suitable cave habitats for large colonies are limited in number, these species are extremely vulnerable to human disturbance. Human disturbance, such as caused by caving activities, panics bats and causes them to waste valuable energy, and may result in abandonment and mortality of young. Destruction of suitable cave habitat through commercialization, flooding by man-made reservoirs, and other causes has resulted in population declines to the point that several species face the threat of extinction. The six other Twilight bats that prefer cave roosting for their colonies will also roost in trees and/or buildings Recognition of the need for cave conservation and protection of bat colonies (natural and urban) from human disturbance is critical for the continued survival of these fascinating animals.

Identification of Florida Bats

Some simple guidelines can help identify Florida bats. Free-tailed bats have naked tails that extend well beyond the wing edge; hairy feet; and narrow wings. Within this group, the Mastiff bats have faces that resemble snub-nosed dogs, hence the name. Florida Twilight bats do not have tails that extend past the wing membrane. Between the three groups of bats, there are more species of Twilight bats in Florida. However, most Floridians will encounter the colony-roosting bats, which tend to be darker in color, often brown, with no fur on the wing or tail membranes. Colony-roosting bats are the types of bats that people encounter most often because these bats are also adaptable to buildings (such as the Brazilian free-tailed bat). Florida's single fruit/leaf-nosed bat possesses a fleshy flap or noseleaf on the snout and large eyes that compensate for relatively poor echolocation abilities.

A simple key to the identification of Florida's 18 species of bats is provided below. The key is divided into bats that roost in caves (seven species) and bats that roost in trees (11 species). Consequently, information on roosting behavior is an important aid to the identification of Florida bats. Back fur color, root color (determined by experts blowing on and parting the back fur), shape of the fleshy part of the ear (the tragus), position of attachment of the tail membrane, and length and density of hairs on the toes are useful characters for identification. The fleshy keel on the calcar (a cartilaginous structure on the rear edge of the tail membrane - see) is also a useful characteristic for distinguishing among similar-looking species.

Identification Key to Florida Bats

Cave Roosting Bats

A. Usually roosting in large colonies (hundreds or thousands)

1. Fur on back uniform gray; wing membrane attached to ankle; tragus narrow and pointed; guano piles under cave roosts; reddish-brown ceiling stains; bats usually not seen in winter

Gray bat (Myotis grisescens) - ENDANGERED (Federal/State)

2. Fur on back brownish gray with dark roots; short gray ears; tragus short narrow and pointed; calcar keeled; no guano piles under roosts; bats usually not seen in winter

Indiana bat (Myotis sodalis) - ENDANGERED (Federal/State)

3. Fur on back short; brownish gray with dark roots; short gray ears; tragus short narrow and pointed; calcar not keeled; usually produces more than one young; will roost in buildings

Southeastern bat (Myotis austroriparius)

B. Usually roosting singly or in very small clusters (fewer than 20)

1. Large size (total length 4" to 5"); fur on back dark brown; dark ears and membranes

Big Brown bat (Eptesicus fuscus)

2. Small size (total length less than 4")

a. Fur on back pale yellowish or pale reddish-brown

Eastern Pipistrelle bat (Pipistrellus subflavus)

b. Fur on back dark glossy brown

Ears long (about 3/4")

Northern Long-eared bat (Myotis septentrionalis)

c. Ears shorter (usually 5/8" or less), ears/face dark

Little Brown bat (Myotis lucifugus)

Tree/Building Roosting Bats

A. Usually roosting in large clusters (hundreds or thousands)

1. Gray body >5", short funnel-like joined ears; narrow brown wings; extended tail; hairy toes with cleaning bristles

Florida Wagners Mastiff bat (Eumops glaucinus floridanus) -ENDANGERED (State)

2. Small body <5", ears not obviously joined

a. Commonly found throughout Florida; 2 lower incisors

Brazilian Free-tailed bat (Tadarida brasiliensis)

b. Only found in the Florida Keys; one lower incisor

Little Mastiff bat (Molossus molossus)

B. Usually roosting singly in or in very small clusters (fewer than 20)

1. Tail does not extend past wing membrane; mouse eared bats; solitary roosters

a. Ears large, ~1" long and joined; lump between the eyes

Rafinesques Big-eared bat (Corynorhinus rafinesquii)

b. Ears <1" long

i. Body fur yellowish

Northern Yellow bat (Lasiurus intermedius)

ii. Body fur red

Red bat (Lasiurus borealis)

iii. Body fur mahogany

Seminole bat (Lasiurus seminolus)

iv. Body fur dark brown with white tips; wing span >15"

Hoary bat (Lasirus cinereus)

v. Body fur dark brown with white tips; wing span <13"

Silver-haired bat (Lasionycteris noctivagans)

vi. Body fur short, sparse, dull brown

Evening bat (Nycticeius humeralis)

2. Lacking tail; nose with fleshy flap; fruit-eating; found in Florida Keys

Jamaican/Antillean Fruit Bat (Artibeus jamaicensis)


This document is Fact Sheet WEC 186, one of a series of the Department of Wildlife Ecology & Conservation, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Publication date: October 2004. Please visit the Edis Web site at

Ginger M. Allen, senior biologist, and Martin B. Main, associate professor, wildlife extension specialist, Southwest Florida Research and Education Center, Immokalee, FL; Department of Wildlife Ecology and Conservation, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611-0304.

The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other extension publications, contact your county Cooperative Extension service.

U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Larry Arrington, Dean.

Copyright Information

This document is copyrighted by the University of Florida, Institute of Food and Agricultural Sciences (UF/IFAS) for the people of the State of Florida. UF/IFAS retains all rights under all conventions, but permits free reproduction by all agents and offices of the Cooperative Extension Service and the people of the State of Florida. Permission is granted to others to use these materials in part or in full for educational purposes, provided that full credit is given to the UF/IFAS, citing the publication, its source, and date of publication.


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Brazilian-Free tail Bats exiting roof at dusk.


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