Beneficial Bats
Do mosquitoes bother you? Do you hate using insect repellants and aerosol
foggers? Have you found that bug zapper to be somewhat less than effective--and
a real annoyance? Maybe it is time to consider a bat colony! While myths have
turned these fuzzy creatures into monsters, bats really are important, useful
members of the ecosystem.
Interesting facts
In the United States and Canada there are no vampire bats. While some bats
carry rabies, the number of carriers is far lower than in many other wild
animals such as raccoons. Besides, rabies kill bats quickly so they rarely
show the aggressiveness seen in rabid dogs or cats. Even the less than half of
one percent of bats that carry rabies normally bite only in self-defense and
pose little threat to people who do not handle them.
A colony of 150 big brown bats can protect local farmers from up to 33
million or more rootworms each summer. The 20 million Mexican free-tails from
Bracken Cave, Texas, eat approximately 200 tons of insects nightly. Best of
all, a single little brown bat can catch more than 1,200 mosquitoes-sized
insects in one hour!
Loss of natural roosts--such as tree cavities or caves--has impacted our
most common species of bats. Providing an alternate roost can encourage bats
to your yard and keep them from seeking shelter in attics.
Suggestions for providing shelter
- Bat houses can be purchased or you can make your own. Books containing
plans can be purchased at many bookstores or you can visit the Bat
Conservation International, Inc. website <www.batcon.org> for
criteria for successful bat houses and answers to frequently asked bat
house questions.
- The best-designed houses are 24 to 36 inches tall, 16 to 24 inches wide,
and 4 to 5 inches deep. Most houses have 1 to 4 (three-quarter inch wide)
roosting chambers. Rough lumber allows bats to cling more easily.
- Houses should be placed at least 10 feet above the ground, 15 to 20 feet
is better. Houses placed on poles or on buildings are preferable to those
hung on trees.
- Bat houses mounted on poles or sides of buildings provide the best
protection against predators. Try to locate the house 20 to 25 feet from
the nearest tree. Using three-quarter inch roosting spaces helps limit
colonization by wasps.
- Houses should be placed so they receive at least 6 hours of sun a day
(more in northern climates), but are protected from bright lights at
night.
- Greatest success will be in areas where water is within a quarter of a
mile and there is diverse habitat, including natural vegetation.
- Bat houses will be most successfully colonized the first year if they
are installed before migrating bats return in the spring.
Caution
As with all wildlife, bats should not be handled. If a bat is close enough
to pick up, it may be sick and should be left alone. You should not attract
bats to places where curious children may try to handle them.
While fear of bats persists in the United States, the Chinese consider bats
a symbol of good luck and some Native American cultures considered them
powerful deities. Given a chance, bats can be a fascinating and beneficial
addition to the wildlife in your neighborhood as they swoop around at dusk
devouring annoying insect pests.
For more information on wildlife habitat and other Backyard
Conservation practices, contact your local conservation district or the Natural
Resources Conservation Service. Or call 1-888-LANDCARE (toll free) for a free
colorful Backyard Conservation booklet and tip sheets.
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