Susan Harris
Susan Harris's blog about eco-friendly and urban gardening, plus the adventures of a DC-based garden writer, coach and occasional rabble-rowser.

Organic Mosquito Control – Bats!

January 19, 2007 · 5 comments

Okay, there’s nothing new happening in my garden this time of year and I need diversions.  Netflix isBathouse a big help but what I miss most on frigid days is connecting with nature, so I recently purchased a bat-house.  It holds up to 100 bats and cost $45 (part of which goes toward conservation efforts, I’m told.)

But buying the house brought so much more than this lovely tree ornament; it revealed to me a whole world of bat conservation.  There’s the Organization for Bat Conservation out of Michigan, from which I ordered my bat-house.   Their site holds a wealth of great info, including how to arrange an in-person program for school kids – too bad it’s only available in Michigan (not to mention only for kids).  The site has a bat-house-owner forum, too, where I found tales of owners counting the bats return to the house in early morning, using their binoculars to identify the species, and more wildlife excitement.  See, I’m such a lousy birder that I’ve experienced only failure at identifying birds, but there are so few bat species in my area, I have a fighting a chance.

Another amazing site is produced by Bat Conservation International, based in Austin (there it is again,Batusgs375 one of the coolest city in the U.S.)  On their site you can join their Adopt a Bat program and receive an "endearing letter from your bat."  Okay, that’s not my favorite part, but how about learning about their backward-facing knees and locking claws make hanging upside down easy?  And then there’s the Latin American bat that eats only blood, the legendary vampire.  So legendary, in fact, that the Wikipedia entry for vampires is about the legends, not the actual animal.  Hey, bat conservation people, how about amending the entry?

Best of all, I learn that a small insect-eating bat can eat up to 2,000 mosquito-size insects in one night – GO TEAM!

I’ve committed to writing a bunch of columns about wildlife as part of my town’s campaign to become certified as a Wildlife Habitat Community, so you’ll be reading more soon about bats, pollinating bees, and good old butterfly gardens.

ADDENDUM, in response to a commenter, about WHERE TO PUT THE BAT-HOUSE.  From the Organization for Bat Conservation site:

In the Northeast: Where you mount your bat house plays a major role in the internal temperature.  Houses can be mounted on such structures as poles, sides of buildings and tall trees without obstructions. Houses placed on poles and structures tend to become occupied quicker than houses placed on trees. Bat houses should face south to southeast to take advantage of the morning sun. In northern states and Canada, bat houses need to receive at least 6 to 8 hours of direct sunlight. It is also advantageous to paint the house black to absorb plenty of heat (when baby bats are born, they need it very warm). Use non-toxic, latex paint to paint your bat house and only paint the outside.  Your bat house should be mounted at least 15 feet above the ground, the higher the house the greater the chance of attracting bats.   

Bats return from migration and awaken from hibernation as early as March in most of the U.S., but stay active year-round in the extreme southern U.S. They will be abundant through out the summer and into late fall. Most houses used by bats are occupied in the first 1 to 6 months (during the first summer the bat house was erected). If bats do not roost in your house by the end of the second summer, move the house to another location.

MORE ON WHETHER THEY WORK:  I once heard a wildlife gardening expert say that it may take a while for the bats to discover the house, but once they find it, it works well.

{ 5 comments }

1 Millie January 19, 2007 at 8:20 pm

Congratulations on this great new project. I have long been a bat fan, although they ARE quite ugly up close. But from a distance they look kind of cuddly. It will certainly give you a warm feeling knowing you’re giving housing and care to little beasties that need it. No mosquitos!! I’ll come sit on your deck all summer. Do report on whether they actually come to your house or if its just batting practice.

2 Ki January 20, 2007 at 8:45 am

I’d be interested if the house actually attracts bats. My wife has been interested in buying a bat house but I was always skeptical and have held off getting one. She’s always half full, I’m half empty. How high did you put the bat house? It looks very high.

3 El January 20, 2007 at 6:24 pm

We put up a bat house on the back gable of our garage in Minneapolis. It worked! We painted it the same color as the garage, and even put an address on it (3426 1/2). Our neighbors thought we were nuts, but hey, the mosquito is like the state bird of Minnesota. I don’t know if 45 of the buggers lived in it, though…maybe more like 4.

4 firefly January 22, 2007 at 9:20 am

One thing I was told when I looked into mounting a bat house on a pole was if you have an active squirrel population in your yard a squirrel baffle is a wise investment — squirrels will most definitely clamber up the pole to investigate and they can disturb the bats (who might go elsewhere for their 40 winks).

My bat house is still only in the planning stage, but I’m looking forward to getting some help with those night-flying June beetles!

5 jenn January 22, 2007 at 6:57 pm

Here’s a helpful hint. Don’t mount your bat house over the garage door. They will visit and use it as temporary housing, as evidenced by the guano on the driveway, but they won’t stay as it is too noisy for them.

I keep intending to move it… maybe this summer.

Ki – It may take a summer or two, but they will come. And they are loads of fun to watch as they swoop around at twilight.

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