How to Remove Bats from your Attic
As the villain of innumerable "B" movies, and the subject of
myth and superstition, bats have an undeservedly bad reputation.
Did you know that they are quite clean, and that they don't fly
into your hair? They don't have more rabies than other mammals,
and they can eat up to 3000 mosquitoes per night - each!
So you want them around.
But while bats are intriguing and beneficial creatures, if they
get into your home, they can become really annoying. Starting in
mid-August (for most of the USA) you will have a window of
opportunity to rid your house of bats relatively easily. Here's
how.
First, you will need to provide alternative housing for the bats
before you start excluding them from your home. Bat populations
have been in decline for the last few years because of lack of
habitat. Additionaly, you want the benefits of having them
around.
The next step is to determine where the bats are coming/going
from your house. There may be one - or many - ways bats are
getting into your home. You may be able to find these entry/exit
points by going into your darkened attic in daylight and look
for light leaks. Or, you may be able to observe the bats coming
and going.
If there are multiple points of entry, you will need to seal
permanently all but the most obvious point of entry (you need to
leave one entry point to allow the bats to leave.)
Once you have eliminated all but one entry point, you will need
to devise a way of allowing the bats to leave, but not reenter.
There are two basic ways of doing this.
1. Each night after the bats leave, temporarily plug the
entry hole, so they cannot return in the morning. If any bats
remain, the next day, open the entry hole to allow the remaining
bats to leave. You may need to repeat the process for several
nights. (Note, depending upon your situation, this method may
require climbing ladders at night. In which case I cannot
recommend this procedure. Use your own judgment.)
2. There are valve-like devices available that allow bats
to leave, but not return. Here's a link to one such device: batfree.com. You can make a check valve
yourself, as described here (page 5) Wildlifecontrol.info. (This pdf
file has lots of valuable bat information.)
The timing of when you do your bat removal is very
important. Your bat removal must be done between mid-August
and mid-May. This is the time when the young bats have been
weaned and can fly, but the bats are not yet breeding again.
This time frame is appropriate for North America. Bat removal at
any other time is inhumane, and will trap bats in your home,
creating other problems. (Check with a local extension agent as
to when bats occupy roosts in your area.)
These procedures should work, but every situation is different.
By providing an alternative roost, you not only get the bats out
of your house, but retain the benefits of having bats around.
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