As a significant predator of night-time flying insects, bats play a vital role in our local and regional ecosystem. A single female Mexican free-tailed bat can consume her weight in insects in a single night. An entire maternal colony can consume several tons of insects in a single night.
Bats trapped in house
- Never touch a bat. They may be sick or injured and a bite can transmit deadly diseases.
- If a bat is found in your home, open as many doors and windows as possible. Bats will typically fly out on their own.
- If the bat does not fly out, place a shoe box over the bat and up against the wall. Then slide a piece of cardboard between the box and wall to contain the bat. Take the captured bat outside, set the box on an elevated platform and remove the lid.
Bats roosting in a crevice on house
If the bats are roosting in a cavity on the outside of the structure, consider letting them stay. However, if you must evict the bats:
- Install 1/16th inch flexible mesh over the crevice and staple the top and sides. Leave 18 - 20 inches of open netting below the crevice opening. Bats will be able to leave from the bottom of the netting and will not be able to return.
- Leave the netting in place for 48 hours, then remove and seal the crevice.
Bats roosting under porch overhang
- Attach mylar balloon or mylar strips under the overhang. This is most effective if a breeze is able to move the mylar.
- Non-toxic cat and dog repellent can be applied, but only when bats are absent.