Human-Wildlife Conflicts: Bats

Close up of bat colonyThere are 26 known bat species in California including the little brown bat (Myotis lucifugus), hoary bat (Lasiurus cinereus), and California’s state bat the pallid bat (Antrozous pallidus). They can be found in diverse landscapes ranging from forests to deserts to rural, suburban and urban environments. Most species eat insects and a single bat can eat thousands each night (up to 100% of their body weight). Some species eat nectar or fruit. 

Bats provide valuable ecosystem services, such as nutrient dispersal and “pest control” (insects) that naturally protect crops and benefit California’s agricultural economy. In the U.S., bats contribute approximately $3.7 billion worth of insect control for farmers each year! 

 
 

Prevent Potential Conflicts

Potential conflict with bats may occur due to human health or safety concerns associated with disease transmission and bat droppings (guano).  

Bats in Buildings 

Bats may sometimes roost in barns and attics or become trapped inside a house or building. A single bat flying in a home or structure is often just lost or confused. In most cases, the bat will try to locate an exit and leave on its own.  

Open windows and exterior doors. Close doors to adjacent rooms.  

Turn off lights and ceiling fans.  

Remain quiet and keep a safe distance. Let the bat leave on its own. 

If a bat does not leave on its own and HAS NOT come into direct contact with humans or pets, consider the following steps:

If a bat does not leave on its own and HAS come into direct contact with humans or pets, Immediately notify: 

  • Local animal services division  

Bats near Buildings 

Seeing one or two bats during the day is not typically cause for concern as bats may leave their roost to eat and drink. A bat that is simply roosting outdoors bear or on a structure (e.g., patio umbrella, stucco wall, behind a sign) does not pose a safety risk if left undisturbed. Do NOT touch live bats. 

If you see a roost site or bat colony (group of roosting bats), CDFW wants to know! 

Injured, Sick or Dead Bat 

Do NOT handle live or dead bats. If a person or pet is bitten or scratched by a bat, or exposed to its saliva – Immediately notify your local health department  

If you find an injured or sick bat, contact your closest wildlife rehabilitator or local animal services division.  

If you find a dead bat, do not handle or touch the carcass. Use proper personal protective equipment (e.g., gloves). Place the carcass inside a plastic bag, then dispose of the carcass and gloves in the trash. 

Bat populations are at risk due to White-Nose Syndrome (WNS). WNS has not been detected in California yet, but we continue to monitor for it. WNS cannot be transmitted to humans or pets. If you find multiple sick or dead bats, or see unusual behavior such as roosting outside in winter, contact the CDFW. 

Safety Tips

Simple steps to reduce the risk of wildlife diseases to you, your family, and pets: 

  • Do NOT handle bats directly.  

  • Bats should be handled only by trained professionals wearing personal protective equipment (e.g., gloves). 

  • Bats can carry rabies. Report any bat acting abnormally. Animals that appear sick or injured are more likely to carry diseases.  

  • Keep pets confined or on a leash. Keep pets current on all of their vaccinations. 

  • Observe wildlife from a respectful and safe distance to protect both you and them. 

Additional Resources

How Can I Help Protect and Conserve Bats? 

Turn out the lights! Protect the night sky by turning off non-essential outdoor lighting. Artificial light can disturb nocturnal animals and change insect behavior: Light Pollution Limits Bat Habitat 

Install “escape ramps” for bats & other wildlife in pools or guzzlers: Water for Wildlife 

Garden for bats: 

Install bat boxes. Place artificial roosts where natural roost sites are limited:  

Support a Motus station. New technology allows bat movements and migratory patterns to be tracked for research and conservation purposes. Learn more: Motus and Terra 

Wildlife Health Lab
1701 Nimbus Road Suite D, Rancho Cordova, CA 95670
(916) 358-2790 | WILAB@wildlife.ca.gov