Bat Houses

A School Where Bats Are Welcome

7/11/19
By Merlin Tuttle

 

Ariel Miller documenting installation of her school’s new bat houses.

Skybridge Academy is doing something new! While many school administrators might panic at the sight of a bat in the yard, Ariel Miller, founder of the school in Dripping Springs, Texas, recently invited us to install two bat houses in her schoolyard. She hopes to attract hundreds of Brazilian free-tailed bats (Tadarida brasiliensis) and use them as teaching aids across Skybridge’s custom-made curriculum.

 

To put it mildly, the school is innovative! The yard includes a pair of pigs, a beehive, a vegetable garden, and now deluxe housing for bats. Students choose their own subjects and learn practical skills, completely omitting standardized testing. Skybridge alumni have an outstanding track record of achievement regardless of whether they opt to pursue higher education or another career path. (more…)

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Young Conservationist Makes a Difference

Young Conservationist Makes a Difference
12/6/18

Anyll Markevich is a young man with a mission. He writes to Merlin, “I became interested in bats thanks to your book, The Secret Lives of Bats. It is one of my favorite books, and I have recommended it to more people than I can count! I have always known bats were cool, but not to the extent I discovered in your book. I want to be a wildlife biologist or ethologist when I grow up, so your book easily fascinated me.”

 

Anyll is far more than just interested. He’s also busily helping bats. He has written letters to editors in response to our Bat Flashes but wanted to do more. Using photos from our photo gallery, he designed his own bat brochures which he handed out to people at a local pedestrian mall. However, people were preoccupied with shopping and didn’t seem too interested.

 

He then emailed Merlin for advice on how to build bat houses that would best accommodate bat needs in the mountain climate of Colorado. He built nine, keeping one for himself, and sold seven to raise funds he donated to MTBC to help bats. But, being a very inventive 14-year-old, he passed his $100 gift through his father, who’s company matched his funds dollar for dollar through American Online Giving Foundation.

 

Lacking an ideal location for his bat house, he had to mount it a bit low, late in 2016. By the next summer, he found his first occupant. This year, Anyll and his mom noticed several bats flying around their yard for the first time. He checked his bat house and counted up to five. They’ve now left for winter, but he’s optimistic that he has the beginning of a colony. He’ll soon contact his customers, each of whom received instructions and one of his brochures. He’s hoping to hear of further success.

 

In his most recent communication, Anyll reported, “There is an exciting new development! Our local library (Boulder Public Library) wants me to build a four-chamber nursery bat house.” Furthermore, he got to meet professor Rick Adams, a well-known bat researcher and fellow conservationist from the School of Biological Sciences at the University of Northern Colorado. Rick will be consulting on placement of Anyll’s bat house, making Anyll very proud! His next objective is to convince the librarians to permit him to provide his brochures to interested library users.

 

 

 

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Collaboration to Improve Housing for Bats

9/20/18

Harrison (standing) and Christopher showing off their new BatBnB houses.

For the past 18 months Merlin has been assisting Harrison Broadhurst and Christopher Rannefors in creating a line of designer bat houses, attractive to both home owners and bats. Their curving architecture isn’t, just pleasing to the eye. At least theoretically, it may increase the area available for roosting, since most bats appear to prefer to line up with faces exposed to the outside air, not to another’s posterior, quite understandable!

The new houses are constructed of kiln-dried, sustainably sourced, three-quarter-inch western red cedar, with each piece dovetailed and caulked, thus minimizing leakage. Roosting chambers are extra tall (20-26 inches) and vented to ensure thermal gradients preferred by bats. All landing and roosting surfaces provide one-eighth-inch-deep cross cuts at half-inch intervals, ensuring maximum footholds for young bats. By avoiding plywood, the possibility of early deterioration and potential off-gassing are finally eliminated. Furthermore, treatment with Thompson’s WaterSeal Semi Transparent Stain & Sealer will additionally protect against warping.  BatBnBs come with complete instructions and are easy to mount.

We’re proud to be a part of Harrison and Chris’ efforts on behalf of bats and a safer environment. They’ve been featured in dozens of leading publications and have even appeared on several television shows. You can learn more about them and obtain your own BatBnB by visiting their online shop. By using the code MERLIN when ordering you will be given a 10% discount, and the company will donate to MTBC an additional 5% of all orders using this code. Feel free to share this discount and BatBnB’s website with friends and let us know about your progress. By purchasing a BatBnB, you can reduce the threat of harmful pesticides in your neighborhood and help MTBC educate the world about these invaluable neighbors.

 

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New Bat House Research Project

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Loss of natural homes in caves and old-growth forests is one of the greatest causes of bat decline worldwide. Unfortunately, many former roosts can never be replaced, leaving an increasingly urgent need for alternative shelter. Wildlife Biologist, Steve Barlow, was one of the first to test the suitability of extra large designs, and he has been experimenting for nearly 20 years. Recently he has supplied his Big Bat House design to nature centers, city parks, wildlife refuges, farmers and private landowners.

Last October, Merlin met with Steve and they agreed to collaborate in developing a new, design that they hope will be even more attractive to bats. Their research proposal was generously funded by MTBC members, Joe and Sharon Goldston, with additional help from Steve. In early April Merlin spent two days with Steve and his construction crew in Kansas brainstorming anticipated improvements.

The result is a new modular design that is much less costly to build and lighter in weight. We also anticipate it’s being even more attractive to bats. It can be mounted on just two instead of four poles, and when a first module fills, more can be added, each one housing up to 4,000 bats. Based on past experience it is quite likely that, at some locations tens of thousands can be attracted, as ability to expand will be unlimited.

(more…)

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chiroptorium design

World’s First Artificial Bat Cave

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World’s First Artificial Bat Cave Provides Model for Future
By Merlin Tuttle
8/14/2016

 

artificial bat cave design
The chiroptorium covers 3,000 square feet (279 square meters) and offers about 8,000 square feet (743 square meters) of likely roosting surface. A structure of welded-together rebar, coated in heavy plastic, was then sprayed with a foot of gunite to form a permanent shell.

Modern bats face a serious housing shortage. Millions of homeless bats have died when their caves were destroyed or converted to exclusive human use, not to mention when old-growth forests were logged. Often, the single most important action we can take to restore bats today is to provide alternative homes.

We know from long experience that desperate bats often readily occupy human-made structures, from abandoned mines and railroad tunnels to old buildings. Though building backyard bat houses is an excellent way to help, sometimes it is very much in our mutual interest to provide long-lasting structures that can accommodate large numbers, not only for pest control, but also for the pure entertainment large colonies can provide.

construction crew at artificial bat cave
Construction crew working in entrance passage. Vertical braces were removed once the gunite hardened.

When J. David Bamberger was first introduced to an evening emergence of the millions of Brazilian free-tailed bats (Tadarida brasiliensis) at Bracken Cave in the Texas Hill Country, he was awestruck. He fell in love with this wonder of nature and soon began asking if it would be possible to attract a miniature Bracken colony to his ranch. Undaunted by an absence of caves, he asked me about the feasibility of “building” a cave.  Would bats come? (more…)

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Formosan golden bats of Taiwan

Mr. Chang and mascot of the Formosan Golden Bat's Home

Mr. Chang and mascot of the Formosan Golden Bats’ Home

Following 30 hours of travel, we spent our first day recuperating in Taipei, got up early the next morning for a 2.5-hour drive to the Formosan Golden Bat’s Home on the campus of the Sheng-Zheng Elementary School, where we met our host, 43-year-old Heng-Chia Chang. As a teacher, he had noticed beautiful little golden bats (Myotis formosus flavus) roosting in school yard tree foliage. (more…)

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Photographing North America’s Rarest Bat

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An endangered Florida bonneted bat, America’s rarest bat, once thought to be extinct.

America’s rarest bat, the endangered Florida bonneted bat (Eumops floridanus), was once relatively common. It often lived in tile roofs of Coral Gables and Miami, and its loud, low-frequency echolocation calls made it easy to detect. The species declined sharply in the 1950’s and early 1960’s, and by the late 1970’s extinction was feared. Then in 1978 woodcutters found a male and seven females in a woodpecker cavity. Soon several more were found living in a backyard bat house.

(more…)

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An Organic Farmer’s Experience with Bat Houses

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DSC00080 (1)
View from above prior to roof attachment.  The sealed-in ceiling between the roof and roosting crevices is for enhanced thermal stability.

Nearly 20 years ago, Frank Bibin, a Georgian pecan grower contacted Merlin for advice on attracting bats to help control insect pests in his orchards. He has since gone organic and become an important advocate for building artificial bat roosts.  To learn of his results go to Pebble Hill Grove–About Bats.

Frank’s first small bat houses were put up in 1998. This video, filmed in Frank’s pecan orchard, tells his early story. It took two years to attract the first bats. Thereafter, numbers grew rapidly. Now that local bats are accustomed to using bat houses, new houses are normally occupied within 30-40 days.

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View from entry (bottom), showing 5 newly installed, 3/4″-wide roosting crevices. One of these houses shelters up to 400 bats.

Through years of testing, he has developed many new innovations. His bat houses and mounting accessories are achieving nearly 100 percent occupancy at many locations in the Southeast and are available for purchase at Frank’s website, Pebble Hill Grove–Bat Houses . Parks and nature centers are among his primary customers.  Though there are many suppliers of smaller bat houses, we know of none better than Frank’s when it comes to long-lasting roosts that attract larger numbers of bats. 

How Frank does it… (more…)

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Bat houses help rice farmers in Spain

checking a bat houseWe would like to highlight a recent study of exceptional importance to all who care about conserving bats. As one who has long promoted the potential benefits of attracting bats to artificial roosts, Merlin is especially pleased with the publication of a recent multi-year study documenting the successful attraction of thousands of bats to small, inexpensive bat houses, leading to well documented reduction of rice pests below threshold levels that require use of chemical pesticides.

The study titled, Pest control service provided by bats in Mediterranean rice paddies, appeared in the journal Mammalian Biology and is available for free download at researchgate.net.

A bat house opened to permit checking by researchers

Soprano pipistrelle bats (Pipistrellus pygmaeus), a common bat widespread across continental Europe, east to western Asia Minor, the Caucasus and Siberia

 

The researchers report that properly located bat houses were readily occupied by soprano pipistrelle bats (Pipistrellus pygmaeus), and that as numbers increased damage from rice borer moths (Chilo supressalis) fell sufficiently to eliminate further need for chemical pesticides. They additionally note that the cost of putting up bat houses was 6-8 times less than that of relying on chemical treatments. These authors also provide an invaluable summary of current knowledge of bat values to agriculture. There are numerous opportunities to expand on this pioneering research which is urgently needed. We deeply appreciate the help of Adrià López-Baucells and Oriol Massana Valeriano in providing outstanding photographic documentation of this project.

Iberian rice field where research was conducted

 

Here’s contact info for ADRIÀ LÓPEZ BAUCELLS
PhD student on Bat Ecology and Conservation

Smithsonian Tropical Research Institute – Instituto Nacional de Pesquisas da Amazônia
Lisbon University – cE3c
Museu de Ciències Naturals de Granollers

PERSONAL PAGE
PhD Project Site
Portuguese Research Group Site
Natural Science Museum of Granollers

Tel.: 351 914 413 804

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