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Delaware's Bat Program


Bats are one of the most mysterious and least understood groups of mammals.

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 naturallyorganic 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.

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! 

Bat Office Number


 White-Nose Syndrome in Delaware

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

WNS Fungus - Photo by Ryan von Linden


Delaware Bats

All things bats - species list, Delaware's research, facts and myths, and what to do if you find one in the wild!

Big Brown Bat - photo by Craig Stihler


Join the Bat Spotters! Volunteers are needed statewide to adopt and monitor bat colonies. 

  • Acoustic Transects - call for details: 302-735-3600

Volunteer Spencer Hacker constructed bat boxes for his Eagle Scout Project.


Reporting Bats 

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 Division of Fish & Wildlife. 

  • To report bats, call the Division of Fish & Wildlife 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. 

Big Brown Bat


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! 


 Contact Us 

Questions, comments or inquiries can be directed to
the Delaware Bat Program by calling 302-735-3600 


  Other Links




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