The Delaware Bat Program

Bats are one of the most mysterious and least understood groups of mammals. Discover the bats of Delaware; the species we have, how to attract or safely evict them, get information about White-Nose Syndrome, find out what the state is doing for bats, and how you can help.

To report a bat colony or for more information about bats in Delaware, call the Delaware Bat Program at 302-735-3600.

Bats are the only mammals that can fly. Some of Delaware’s tree bat species migrate long distances from summer roosts to their wintering grounds, while our cave bat species fly to the caves and mines of other states to hibernate. In their travels, they have been known to fly over land, along coastlines and over water much like migrating birds. Each spring, our bats return and grow strong after the long drain of winter by feasting on Delaware’s insects.

Bats provide a valuable and naturally organic service to people – we do not miss the mosquitoes, beetles, moths, and crop pests that bats eat! In fact, to gain the energy needed to nurse their young, female bats can eat the equivalent of their body weight in insects each night. Having a lifespan of 5 to 20 years and raising only one pup per summer (some species have twins), bats are loyal and will return to the same roost every year.

White-Nose Syndrome

Bats hibernating at Fort Delaware and Fort DuPont State Parks were confirmed to have White-Nose Syndrome (WNS) in 2012.

White-Nose Syndrome Fact Sheet (2019)

White-Nose Syndrome Map (White-Nose Syndrome Response Team)

Delaware Bats

Closeup of a brown bat hanging upside down.

All things bats – species list, Delaware’s research, facts and myths, and what to do if you find one in the wild.

Delaware Bat Species List

Delaware’s Bat Research

Bat Myths and Facts

What to do with uninjured Bats in Your House or Yard, injured Bats, or Dead Bats

Become a Bat Spotter

Volunteer with us and find or adopt a bat colony. Count the bats as they leave their roosts to feed in the evenings.

The colony could be in a barn, attic, tree or bat box — anywhere you find a group of bats together. If you do not know of any roost sites, you can contact us to adopt one in your area.

Bat Spotter Volunteer Packet

Bats are extremely beneficial to our environment and monitoring them is a fun and rewarding activity for all ages. It is an interesting and unique way to connect with nature and to do something helpful for wildlife. Anyone can volunteer.

Volunteers can also help with Acoustic Transects. Call us for details at 302-735-3600.

Reporting Bats

Photo of a group of bats tightly packed together and roosting under the peak of a ceiling structure.

Have bats or know where bats spend their days? Let us know. If you see bats flying through your neighborhood on summer nights, try to find their roost nearby first, then report your find to the DNREC Division of Fish and Wildlife. Call us at 302-735-3600.

Bats in Buildings

From one bat to many, information and resources for how to address bats in buildings such as helpful tips, times of year to avoid, and methods to bat-proof a building responsibly. For concerns or instructions about rabies testing, call 866-972-9705.

Removing a Bat

Safely Catching a Bat in Your Home

Best Management Practices for Bat Exclusions

Delaware’s Permitted Wildlife Control Operators

Bats and Health Concerns

Bat Boxes

Provide backyard habitat and invite organic pest control. Instructions for providing bat habitat. Be sure not to put your box on a tree. Bats do not usually use boxes placed on trees.

Bat Box Tips

Bat Box Building Plans (from the Pennsylvania Game Commission)