The 48th Annual Symposium on Bat Research was held in Puerto Vallarta, Mexico October 24-27. Hurricane Willa threatened but failed to dampen the enthusiasm of attendees who ended up enjoying perfect weather in a beautiful location. Our hosts Jorge Ortega and Rodrigo Medellin did a great job, and we were very favorably impressed with the outstanding conservation orientation of Mexican colleagues. Mexico’s students had an unusual opportunity to present their projects, ranging from bat pest control in walnut orchards to seed dispersal and the pollination of agaves from which all tequilla is derived. Additional areas of conservation interest involved impacts of wind turbines, management of white-nose syndrome, and protection of roosts.
Many attendees were delighted to meet Teresa and share insights on the needs of bats. Based on his 60 years of field experience, Merlin has become increasingly concerned to see so many of today’s remaining bats living in marginal, sometimes barely survivable conditions, especially in caves. These unfortunate circumstances easily can be misinterpreted as what bats need, leading to inappropriate conservation measures. He was encouraged to see rapidly growing awareness of the futility of stopping or curing white-nose syndrome, with increasing focus on protection of survivors from disturbance at roosts. Where bats were protected from disturbance, signs of stabilization and recovery were reported.
The keynote speaker for the 72nd Cape May Fall Festival was not a birder this year, but batman Merlin! His talk was on the evening of October 20, 2018 in the Grand Hotel with the theme The Incredible World of Bats. It seems as though birders are enthusiastic about bats as well. The response was overwhelmingly positive, with many giving up birding the following morning to attend his bat workshop. Participants had opportunities to ask questions and learn more about threats to bats and how to help them. We made many new friends for ourselves and bats. David Lapuma, Director of the Cape May Bird Observatory remarked, “We pride ourselves in attracting the best speakers for our evening presentations, but this year was over the top.” We thank David and New Jersey Audubon for the opportunity!
PechaKucha [ or ペチャクチャ translated as “chit-chat”] is a series of 6-minute talks from presenters in the creative industry including artists, musicians, architects, filmmakers, writers, entrepreneurs, and local personalities. Each presenter showed 20 images, each lasting for just 20 seconds. PechaKucha events foster the art of concise presentations. This year’s PechaKucha Night Austin #32 was held in Austin on October 11, 2018. Merlin was honored to be invited by Austinites DJ Stout and Lana McGilvray, the hosts of PK ATX.
The following ten speakers each had 6 minutes to promote a subject in their area of expertise. Merlin, of course, promoted bats with emphasis on those in Austin and had an outstanding response.
Herman Dyal – Graphic Designer/Architect
Gretchen Harries Graham – Educator
Dave McClinton – Graphic Designer/Artist
Refugee Is Not My Name (Aaron Weiss, Jess Archer and Ashley St. Clair) – Art Collaborators
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.
In early August, we accepted a partnership invitation to develop a series of bat conservation and management training videos. Though growing numbers of biologists are studying bats, few have the breadth of experience essential to meet their widely varying conservation needs. Each species has unique requirements. In order to better share my nearly 60 years of personal experience, John Chenger founder of Bat Conservation and Management, and Janet Tyburec founder of Bat Survey Solutions, invited me to collaborate. They are providing video shooting and editing, featuring my narration and illustrations.
Four programs are now being edited. The first, tentatively titled “Win Friends, not Battles,” explains key approaches that have most effectively won long-term cooperation. The second features the worldwide importance of bats. The third addresses greatly exaggerated disease claims, and the fourth deals with assessing cave suitability for bats and special long-term management needs.
Under John’s guidance, we began field shooting on August 15, greatly aided by Teresa Nichta and John’s associate, Julie Zeyzus. For the next 10 days there was little time for sleep or even eating. On my birthday, we spent seven hours filming underground, a great antidote for thinking of getting old!
Illustrating the need for such education, one of the caves we visited in a protected nature reserve, had lost its entire colony of tens of thousands of cave myotis when fire protection permitted entrance blockage by vegetation. Another cave, also well protected by its owner, had overgrowth of an invasive, introduced plant that could have prevented restoration of a formerly large colony. It only took minutes to eliminate the threat.
For many years we’ve wondered just how many Brazilian free-tailed bats (Tadarida brasiliensis) could cram into a single 18-inch-deep bridge crevice. Accurate counts of large colonies are difficult no matter how they’re made. However, when estimating bridge colonies, it would help if we knew the number, using an average horizontal foot of crevice.
The solution seemed easy. Two years ago, Glen Novinger, an MTBC member and I, inserted two, three-quarter-inch-thick wooden frames, each encompassing a square foot of interior space, into bridge crevices of the same width while the bats were out feeding. The idea was to later slowly remove them, forcing those roosting inside to exit into a cloth-lined bag from which we would count them.
However, the bats were full of surprises. The first night we waited patiently till half an hour after we’d seen the last ones leave—or at least that was what we thought! But when we approached to install our devices, roughly half remained inside. I couldn’t help but wonder how many emergence counts had missed those that, for whatever their reasons, didn’t emerge at sundown. (more…)
Every year around this time there is a spike in needlessly sensational rabies stories featuring exaggerations of truth. We always encourage others to respond politely to editors, authors, decision makers and media personnel when they see these. Editors’ jobs depend on readership and they do aim to please. They just need to know you like or dislike an article. Responses can be very simple such as, “I don’t appreciate sensational headlines or speculation that creates needless fear of bats.”
We work hard to be a source for your personal ambassadorship of bats and wish we could respond to every article, however our resources are limited. We cannot do it alone. We hope that this post will supplement your future responses when you encounter false or exaggerated bat publicity.
Unfortunately, this well intended story is a sensational exaggeration of truth. It is correct to say that most human rabies in America comes from bats. However, put in context, it’s just 1-2 cases per year, making it one of the rarest causes of death. By comparison, just by riding one mile in a motorized vehicle, an American exceeds his/her annual risk of rabies from any source.
Because even sick bats almost never bite, except in self-defense if handled, the risk of contracting any disease from one is exceedingly low for anyone who simply leaves them alone. In Austin, Texas, thousands of people gather nightly to observe the spectacular emergences of 1.5 million bats close-up. And in decades of this exceptionally close association, no one has been attacked or contracted a disease.
Post-exposure rabies vaccinations in the United States are outrageously overpriced, currently costing from $10,000 to $22,000 per person treated. With huge profits at stake, and our CDC heavily influenced by drug companies, promotion of exaggerated fear is not surprising. Unprovoked bites are exceedingly rare, so much so that I have yet to experience one despite close association with millions of bats worldwide for more nearly 60 years.
Human rabies cases are often diagnosed post-mortem or after the patient is incoherent. Even in cases in which parents or friends report bites, the U.S. CDC reports “no bite history” unless the patient is able to confirm. Consequently, human cases, regardless of animal origin (i.e. bat, dog, skunk or raccoon) often get reported as having no bite history. Huge misrepresentation occurs when such reports are used to disproportionately frighten people of bats.
Since 1996 the CDC Advisory Committee on Immunization Practices has advised consideration of post-exposure prophylaxis for “persons potentially exposed to bats even where a history of physical contact cannot be elicited,” unless prompt diagnosis excluded rabies. Based on its independent analysis Canada’s National Advisory Committee on Immunization, opted not to follow CDC’s recommended bat policy. They do not advise vaccination unless there has been direct contact. For detailed documentation, see Rabies in Perspective.
Building bat roosts into highway bridges in farmlands can benefit farmers at little or no cost to taxpayers. Mark Bloschock, a supervising bridge design engineer at the Texas Department of Transportation, discovered the potential for bridges to help bats when he worked on Austin’s now famous Congress Avenue Bridge. As hundreds of thousands of bats unexpectedly moved in, he contacted me for advice. He soon discovered that, by simply making small adjustments in the spacing between box beams, large numbers of bats could be attracted where needed, and where they weren’t wanted, they could be discouraged by simply changing the spacing.
In 1998, when highway US 90 required two new bridges over Seco Creek, near D’Hanis, Texas, he wrote specifications that placed the box beams three quarters to 1.5 inches apart, hoping to attract Brazilian free-tailed bats (Tadarida brasiliensis) to this important agricultural area. The bats quickly moved in and soon exceeded half a million, today as many as two million.
At Merlin Tuttle’s Bat Conservation we’re overjoyed to finally launch our membership campaign. Members at the Leadership level or above were given priority invitations to view the famous Congress Avenue Bridge bat emergence with Merlin aboard a chartered Capital Cruises boat. We all gathered at the Hyatt Hotel’s lounge for drinks (and queso) and to meet and get acquainted. The first member to sign up for the cruise was Janell Cannon, the author of the classic children’s book Stellaluna. Janell graciously signed copies of her book, which is celebrating its 25th anniversary!
The Texas Department of Transportation (TxDOT) has set world records when it comes to helping bats, and that special help is paying big dividends for Texans and for countless visitors. Thanks to the enthusiastic early leadership of Supervising Bridge Engineer, Mark Bloschock and the continuing efforts of Stirling Robertson, now in charge of Strategic Projects, and John Young, an Environmental Specialist, TxDOT is taking great pride in its accomplishments.
On August 21, Stirling and John organized a special bat evening for 30 of TxDOT’s most important media and public information officers. They each received a copy of Department’s new guide to bat watching at state bridges, attended my 20-minute presentation at TxDOT headquarters, then joined me for a special Congress Avenue Bridge bat watching evening. We were delighted when we learned that Mark, who is now retired, would be able to join us.
The bats performed beautifully, and Stirling reported, “There has been overwhelming positive response to your talk and the whole event. Good stuff!” A big thank you to Stirling for making this event possible! We look forward to future collaboration and many more bats in Texas bridges.
Merlin Tuttle’s Bat Conservation is the most recent contribution by Merlin Tuttle to the world of bats. With over 50 years of in-depth knowledge and experience Merlin Tuttle, renowned bat expert, educator and wildlife photographer founded MTBC with one true goal in mind; teaching the world to understand and appreciate the vital contributions bats make to human beings and the world we live in.