Key Takeaways
- Bats in the attic can pose health risks and cause structural damage, so identifying an infestation early is crucial.
- Look for visual signs such as bat sightings at dusk, dark rub marks, and guano droppings to detect an infestation.
- Listen for sounds like high-pitched squeaking and scratching to confirm the presence of bats.
- Detect odors like ammonia from urine and musty smells from guano, indicating a mature colony.
- Consult a professional for humane removal and ensure compliance with legal protections for bat species.
You’ll rarely notice a bat infestation when it starts. Bats are small and nocturnal, so it is easy to miss the first time they get into the attic. Most people notice several signs of bats rather than a single definitive piece of evidence.
While bats play an important role in the environment, it is not okay to have bats in the attic. Their presence within a human dwelling poses significant risks to the structure and your health. Identifying an infestation early is critical to preventing structural damage and mitigating severe health hazards.
Based on what you’ve seen, heard, and smelled, you can identify a bat infestation.
What Do You See Outside: Visual Signs of an Infestation
The exterior of your home serves as the first line of defense and the most prominent source of evidence. By conducting a systematic perimeter check, you can identify the colony’s “flight paths” and entry points.
1. Sighting Bats at Dusk and Dawn
The most definitive visual evidence is observing the bats as they leave. Position yourself at a vantage point where you can see the roofline against the fading light of dusk. Bats typically exit their roost 15 to 30 minutes after sunset to forage. Conversely, at dawn, they return to the roost. Look for small, erratic silhouettes swirling around chimneys, gable vents, or loose fascia boards.
2. Discoloration and Rub Marks Near Entry Points
Bats possess natural oils in their fur and skin. As they squeeze through tight crevices—some as narrow as half an inch—these oils, combined with dirt and urine, leave behind a distinct residue. Look for dark, brownish-black oily stains around small gaps in the siding, corners of the eaves, or near shingles. These “rub marks” act as a biological roadmap indicating a primary entry point.
3. The Accumulation of Guano (Droppings)
Unlike birds, which scatter droppings, bats often defecate just before entering or exiting their roost. Check your porch, windowsills, and the ground directly beneath eaves for concentrated piles of droppings. A vertical accumulation against the side of the house is a primary indicator of a roost directly above.
What Do You Hear: Sounds That Signal a Bat Colony
While bats are relatively quiet during the day, a large colony will produce audible signals, particularly when disturbed or preparing for flight.
1. High-Pitched Squeaking
Bats communicate using vocalizations. While much of their echolocation is ultrasonic and beyond human hearing, they do emit sharp, metallic squeaks and social “chatter” that can be heard through ceilings and walls.
2. Scratching and Rustling Within Walls or Attics
As bats move to find more comfortable temperatures or shift positions within the roost, you may hear scratching sounds. This often sounds like light scuttling or the crinkle of paper. These noises are most prevalent at dusk and just before dawn.
3. Chirping During Temperature Fluctuations
On exceptionally hot days, bats may move lower in the wall voids to escape the heat of the attic, leading to increased vocalization. Similarly, sudden cold snaps can trigger activity as the bats cluster together for warmth.
What Am I Smelling?: Detecting the Presence Through Scent
A mature bat colony produces a scent profile that is unmistakable once detected. These odors are not merely unpleasant; they indicate the presence of decomposing organic matter.
1. The Pungent Odor of Ammonia
Bat urine has a very high concentration of urea. In a confined, poorly ventilated space like an attic, this evaporates into a sharp, acrid ammonia smell. If a room or crawlspace smells like a dirty litter box despite having no pets, bats are a likely culprit.
2. The Musty Scent of Stagnant Guano
As guano accumulates and begins to decompose, it emits a heavy, musty, and sweet-rotten odor. This scent is pervasive and can eventually penetrate drywall, lingering in the home’s living spaces even after the bats are gone.
Interior Evidence: Signs Within the Living Space
When a colony gets large enough, you might start to notice physical evidence inside the living areas of your home. In some cases, a bat can become disoriented and end up in the primary living areas of your home, like a bedroom.
When an infestation reaches a critical mass, or when younger bats become disoriented, signs will begin to manifest inside the primary living areas.
1. Unexpected Stains on Ceilings and Walls
Large accumulations of guano and urine in the attic can eventually seep through the ceiling. This appears as dark, yellowish-brown staining that may be mistaken for a water leak. However, unlike water leaks, these stains are often accompanied by a foul odor.
2. Dead Bats in Basements or Living Areas
Finding a dead bat is a clear sign of an established colony. Juvenile bats often take “wrong turns” and end up in the living space via the chimney or utility gaps. Do not handle a dead bat without heavy gloves and a shovel; they can still harbor pathogens or parasites.
Health and Safety Hazards from a Bat Infestation
Ignoring a bat infestation is a dangerous gamble. The longer the colony remains, the higher the risk to the residents and the building’s integrity.
1. Histoplasmosis Risks
The most severe threat is Histoplasma capsulatum, a fungus that grows in bat guano. When the guano is disturbed, fungal spores become airborne. If inhaled, they cause Histoplasmosis, a serious respiratory infection that can lead to chronic lung disease or systemic infection.
2. Ectoparasites: Bat Bugs
Bats carry their own species of parasites, known as “bat bugs.” These are closely related to bed bugs. If the bat colony is removed but the nesting site is not properly sanitized, these bugs will migrate into the living quarters to find a new host—humans.
3. Structural Corrosion and Fire Hazards
The acidic nature of bat urine and guano is corrosive. Over time, it can rot wooden support beams and degrade insulation. Furthermore, if guano accumulates around electrical wiring, it creates a significant fire hazard by trapping heat and corroding wire insulation.
What Should I Do if I Think I Have Bats?
If you observe two or more of the signs listed above, it is time to consult a professional wildlife specialist.
Evaluating the Scope of the Infestation
A professional can determine the colony’s size and identify every potential entry point. They use specialized equipment, such as thermal cameras and borescopes, to locate bats tucked deep within structural voids.
The Importance of Humane Exclusion Over Bat Extermination
Across the United States and Canada, it is illegal to kill bats. Professional exclusion involves installing “one-way doors” that allow bats to exit the home but prevent their re-entry. This is the only effective and legal method for long-term removal.
Legal Protections for Bat Species
Many bat species are protected under federal and state laws, especially during “blackout periods” when flightless pups are present (typically mid-summer). A professional ensures that your removal process complies with the Endangered Species Act and local wildlife regulations.
Summary Checklist for Homeowners
To determine if you have a bat problem, perform a systematic audit using this checklist:
- Exterior: Check for dark, oily rub marks around eaves and vents.
- Ground level: Look for shiny, metallic-flecked droppings on porches or windowsills.
- Attic: Inspect for “pyramids” of guano and the smell of ammonia.
- Auditory: Listen for scratching or high-pitched squeaking at sunset.
- Visual: Monitor the roofline at dusk for emerging silhouettes.
If you confirm these signs, maintain a safe distance and contact a certified wildlife professional immediately. Do not attempt to seal entry points yourself until you are certain all bats have exited, as trapping them inside will lead to further structural damage and health risks.
During an inspection, we found a maternity roost in this attic. You usually cannot hear a single bat, but in colonies this size in an enclosed space, you can hear bat noises in the attic. Like most mammals, bats have vocalizations to communicate. These vocalizations typically sound like squeaking or chittering sounds. You can hear these sounds at dusk or dawn when bats are most active. (Did you know bats are one of the few mammals that sing?)
Texas is home to 32 bat species, the most in the United States (47 species of bats are in the country). Bracken Caves, just north of San Antonio, is home to 15 million bats and is the largest known bat colony! If you’re looking for something a little closer, the Fort Worth Botanical Garden is home to five different bat species.
A suitable bat habitat has close access to water, ample food supply, and a safe place to roost during the day. Natural roosting locations include caves and hollowed trees. Suburban and agricultural landscapes provide similar habitat requirements. Bats will roost in mines, under bridges, in bards, in your attic, inside the walls, or on your roof.
Why are Bats Protected in Texas?
Out of the 32 local bat species, three are federally protected: the Mexican Long-nosed bat, the Tricolored bat, and the Northern Long-eared bat (recorded only once in Texas). The Southern Yellow bat is considered a threatened bat by the state, but it stays in the southern part of the state.
Bat Populations in Texas Threatened
Despite the benefits bats provide, the bat populations are threatened.
- White-nose syndrome is a fungal disease that spreads through bat colonies and has almost eliminated the Northern long-eared, little brown, and tri-colored bats.
- Bats do not reproduce as quickly as other wildlife. The females typically give birth to one or two pups a year. Slow reproduction puts the species at risk for population decline.
- Pesticides used by farmers reduce the number of bugs available for bats to eat.
- Wind turbines kill hundreds of thousands of migrating bats around the world.
Benefits of Bats in Texas
All bats in Cedar Hill are insectivores (no vampire bats). Some small bats can consume up to 1000 small insects in a single hour. A nursing female bat can consume more than 4000 insects a night. It is estimated bats save U.S. farmers roughly $23 billion each year by reducing crop damage and limiting the need for pesticides.
Roosting Bat Concerns in Cedar Hills
Bats provide tremendous value; however, you do not want bats roosting in your house. Bats pose very little direct danger to people, but they can spread diseases and damage your property.
Bats defecate where they roost. Bat droppings, or guano, can accumulate within walls and attics as well as on the ground and roof tiles. The nutrient-rich droppings cultivate the growth of histoplasmosis fungus, which causes severe respiratory problems in humans.
Bats are indeed capable of contracting and transmitting the rabies virus. Rabies is transmitted via scratch, bite, or when infected saliva comes into contact with human eyes, mouths, or open wounds. So if you find bats in your house, avoid contact!
Bats also harbor ticks and fleas. Those parasites can find new hosts like your family and pets.
Bat Removal in Cedar Hills, TX
To get rid of bats in Cedar Hills, the most effective and humane method is with a bat valve. The exclusion device allows bats to fly out on their own but keeps them out. In the state of Texas, it is illegal to hunt a bat with an exception if that bat is inside a structure.
Bat Exclusions Restrictions in Texas
The current bat regulations in Texas are:
Sec. 63.101. PROTECTION OF BATS. (a) Except as provided by Subsections (b) and (c), no person may:
(1) hunt a bat; or
(2) sell, offer for sale, purchase, offer to purchase, or possess after purchase a bat or any part of a bat, dead or alive.
(b) A bat may be removed or hunted if the bat is inside or on a building occupied by people.
(c) This section does not apply to:
(1) an animal control officer, a peace officer, or a health official who captures a bat that the officer or official considers injured or diseased;
(2) a person who transports a bat for the purpose of laboratory testing if the bat has exposed or potentially exposed humans or domestic animals to rabies; or
(3) a person who is licensed to provide pest control serviceshttps://statutes.capitol.texas.gov/Docs/PW/htm/PW.63.htm#63.101
However, legislation revises and expands the protection of bats to take effect September 1, 2025. The bill requires only nonlethal exclusion methods to be used for bat control, and the bat valve cannot be installed between May 1 and August 31.
Who should call for bat removal in Dallas-Fort Worth Metroplex?
You should call a licensed Nuisance Wildlife Control Operator in Texas ecause bats must be removed from structures through a process of exclusion, not extermination. Regardless of the laws, at Critter Control, we only use the most humane and ethical removal methods for bats.
How to Get Rid of Bats
The most effective and humane way to remove bats is by utilizing a bat valve with a full home exclusion. Exclusion, not bat exterminator. A bat valve allows for bats to exit your home but not re-enter. Since each bat removal is unique, our specialist will use or create a bat valve specifically for your home.
Once the bat valve is installed, all other entry points will be sealed, allowing bats to exit only through the valve. The removal process typically takes 3-7 days. Our specialist will perform a final attic inspection before removing the valve. After removing the valve, the final entry point will be sealed, leaving your home bat-free.
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Pictures of Bats in the Attic
Bat Guano Identification – Signs of Bats in Attic
How Bats Get into Your House
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Reviews of Critter Control in Dallas-Fort Worth, Texas
Spring and summer are the most common times of year for people in Raleigh-Durham to experience a bat infestation. Bats are relatively harmless to people. It is exceedingly rare to get bitten by a bat. In fact, bats around your property can help with pest control. Flying insects like mosquitoes make up the majority of their diet.
But bats in the attic are dangerous. People tend to notice a foul odor first. The accumulation of guano and urine damages insulation, spreads diseases, and creates a foul odor. It’s also common to see bats flying out of your house, especially if the maternity colony is rather large. Bats leave rub marks or dark smudges where they crawl out of your attic. Finally, if you have bats in the attic, you can hear chirping or squeaking sounds.
Follow a bat inspection with the Critter Control team in Durham.
Bat Guano in Attic Insulation
How to Find Where Bats are Getting In
Bats cannot create their own opening like other nuisance wildlife, but they need a gap no bigger than 3/8ths of an inch—about the size of a dime. The only efficient bat control is to seal all entry points. If you leave one gap open, the bats can return.
The most common bat entry points on a house:
- Attic vents
- Soffits
- Fascia boards
- Ridge Vents
- Gable Vents
- Roof returns or eaves
- Siding
- Chimneys
To illustrate the variety of entry gaps a bat uses, follow along this visual tour.
Fascia Boards Behind the Gutter
Bats found a construction gap on the fascia board of this house. Construction gaps are common in the South. They help with attic ventilation and can prevent leaks.
Loose Shingles
Some of these can be difficult to see. The bats were able to squeeze under loose shingles where to roof ends and meets the gutters.
Roof Vents
If there is a bat infestation in the attic, every roof vent needs to be checked. From the ground, these may seem secure, but it is impossible to spot a dime-sized hole from 20 feet away. During the Critter Control bat inspection, we climb onto the roof and scour the attic to find all entry points.
Soffits
These soffit vents have no apparent damage, but a bat can get through these gaps!
Other Bat Entry Points
Bats Behind the Shutters
Bats look for darkness for shelter during the day. Some species will roost on trees, under leaves or bark. The small gap between the exterior of the wall and the window shutters provides all the space a bat needs.
Professional Bat Removal
Humane bat removal is best left to the professionals at Critter Contorl. Most homeowners do not have the experience or the skills to identify all the potential bat entry points on your house. Attempting DIY bat removal can leave you vulnerable to a continued bat infestation. Furthermore, Most states have specific dates when bat removal can be done. If juvenile bats are present (commonly the case during the summer), it is inhumane to install bat exclusions. The mothers cannot return to the juveniles, leaving the young starving. At Critter Control, we have the training and experience to find all bat entry points which is essential for effective bat removal.
All photos courtesy of Critter Control Triangle
Bats Hiding in an Attic
These bats were discovered in a Kansas City, MO attic. If you suspect bats in your attic, call the professionals at Critter Control at 1-800-274-8837, or visit https://www.crittercontrol.com/office-finder.If you have bats in your attic, you might notice them flying out of your attic at dusk. Observe from a distance!
Position yourself at a vantage point where you can see the roofline against the fading light of dusk. Bats typically exit their roost 15 to 30 minutes after sunset to forage. Conversely, at dawn, they return to the roost. Look for small, erratic silhouettes swirling around chimneys, gable vents, or loose fascia boards.
Look for small openings around your roofline, eaves, vents, or chimney. Bats can squeeze through gaps as small as 3/8 of an inch.
Watch Bats Leaving Attics
Video from Houston and The Woodlands.
There are thirteen species of bats in Florida. The big brown bat and little brown bat are two of the most common bat species to roost in your attic.
Bats are found in nearly every geographic region in Florida. Favorite environments include tropical forests, woodlands, open fields, both suburban and urban communities, and even deserts. Roosting requirements usually depend on the species, but caves, trees, hollowed logs, rock crevices, and human dwellings serve as excellent habitats.
Should I Call an Exterminator for Bat Control?
You should call a wildlife control operator like the professionals at Critter Control. Exterminators are trained to handle pests using chemicals. At Critter Control, we have decades of experience and training to safely remove bats from your attic, repair the damage, and seal your house to prevent future infestations.
Florida Administrative Code rule 68A-4.001 on General Prohibitions and 68A-9.010 on Taking Nuisance Wildlife says it is illegal to kill any bat. In addition, you can’t take, transport, store, buy, sell, or possess a bat at any time. Bats have additional protections during the maternity season. They cannot be harassed or encouraged to leave their roost in any way. In Florida, bats cannot be taken as nuisance wildlife, even if they are causing a nuisance.
Some small bats can consume up to 1000 small insects in a single hour. A nursing female bat can consume more than 4000 insects a night. It is estimated bats save U.S. farmers roughly $23 billion each year by reducing crop damage and limiting the need for pesticides.
Bat Populations in Florida Threatened
Despite the benefits bats provide, the bat populations are threatened.
- White-nose syndrome is a fungal disease that spreads through bat colonies and has almost eliminated the Northern long-eared, little brown, and tri-colored bats.
- Bats do not reproduce as quickly as other wildlife. The females typically give birth to one or two pups a year. Slow reproduction puts the species at risk for population decline.
- Pesticides used by farmers reduce the number of bugs available for bats to eat.
- Wind turbines kill hundreds of thousands of migrating bats around the world.
Roosting Bat Concerns in Tallahassee
Bats provide tremendous value; however, you do not want bats roosting in your house. Bats pose very little direct danger to people, but they can spread diseases and damage your property.
Bats defecate where they roost. Bat droppings, or guano, can accumulate within walls and attics as well as on the ground and roof tiles. The nutrient-rich droppings cultivate the growth of histoplasmosis fungus, which causes severe respiratory problems in humans.
Bats are indeed capable of contracting and transmitting the rabies virus. Rabies is transmitted via scratch, bite, or when infected saliva comes into contact with human eyes, mouths, or open wounds. So if you find bats in your house, avoid contact!
Bats also harbor ticks and fleas. Those parasites can find new hosts like your family and pets.
Bat Removal in Tallahassee, Florida
To get rid of bats in Tallahassee, you need to use exclusion, not an exterminator.
Bat Exclusion Restrictions in Florida
Bat maternity colonies begin to form in early April. These roosts are frequently near areas prone to insect swarms such as fields, ponds, or neighborhoods. In the late spring or summer, homeowners who see bats leaving an attic or overhang at twilight may need to check for an infestation.
If you need bat removal between April 15 and August 15, you need a special permit to install bat exclusions.
Spring is ideal for bat removal as it coincides with their return from hibernation or migration but before maternity season starts. After maternity season, the bat colony disperses. Some bats return to the same roost year after year. If you want to prevent bats from entering your home, preventative exclusion is the best precaution you can take.
How to Get Rid of Bats
The most effective and humane way to remove bats is by utilizing a bat valve in conjunction with a full home exclusion. A bat valve allows for bats to exit your home but not re-enter. Since every bat removal service in Tallahassee is unique, our specialist will use or create a bat valve specifically for your home.
Once the bat valve is installed, all other entry points will be sealed, allowing for bats to exit only through the valve. The removal process typically takes 3-7 days. Our specialist will perform a final attic inspection before removing the valve. After removing the valve, the final entry point will be sealed, leaving your home bat-free.