Experiencing Texas Bats

By Renee Anna Cornue
4/22/19

As MTBC’s Photo Collection Administrator, much of my responsibility lies behind a computer screen. I’d seen thousands (about 120,000 if we’re being real) of photographs from Merlin’s most-active field work days, preparing me for what to expect as much as photographs can. I’d seen mist nets, harp traps, banded bats, guano piles, and evidence of the bats’ incredible diversity.

Though fortunate to see Austin’s bats in a variety of ways, I’d never worked with bats first-hand. On this trip, I was most excited to step away from the desk and learn how bats are studied in the field, especially surrounded by knowledgeable and talented peers.

As with MTBC’s past adventures, our trip was a hands-on working trip with invaluable time and expertise contributed by leading colleagues from varied specialties. We were in the company of expert bat researchers, photographers, videographers, rehabilitators, consultants and passionate citizen scientists as we searched for some of the least known bats in the U.S.

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Bat Association at Texas State Lecture

The Bat Association at Texas State University (BATS) in San Marcos is only a few months old, but already boasts more than 150 members. Its mission is to raise awareness and concern for these long neglected, but essential animals.

Merlin Tuttle speaking to the Texas State Bat Association at Texas State University.

The organization’s three main goals are to share hands-on opportunities to learn about bats, network with professionals, and spread awareness of bat values and needs. It is led by Jacob Rogers (President) and Danielle Cordani (Vice President), under the supervision of Assistant Professor, Sarah Fritts. They’re planning a wide variety of special events to raise interest and concern, including field trips, invited lectures, bat house building projects, and opportunities for graduate students to share their experiences.

 

Merlin was their invited speaker on February 26. His topic, “Planning a Career—Why Bats?” His mission was to introduce bats as a too-long overlooked gold mine of research need and opportunity and to provide tips on how to succeed as a scientist. His advice–Follow your passion. Address issues most relevant to humans. Practice strong science. Seek mentor opportunities. And learn to entertain. Of course, the message was well illustrated with “How to” examples, including photography and public sharing.

The response was overwhelming. Following his formal presentation, he was peppered with enthusiastic questions for another hour.

Watch the video!

 

Merlin says he’s rarely encountered a more appreciative audience.

Sarah Fritts, The Bat Association at Texas State’s enthusiastic biology department mentor.

Jacob Rogers, The Bat Association of Texas State president led a hearty thank you. He and vice president, Dani Cordani, are planning additional partnership activities, and Merlin is looking forward to assisting. He would love to see this group become a model for others.

 

 

 

 

 

 

 

 

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Bat Flash! Australian Flying Foxes Urgently Need Immediate Help

Cairns Mayor, Bob Manning, wants to force flying fox survivors to leave his city. This is planned for the near future, making it an urgent issue. Recent heat stress and starvation have killed 1/3 of the flying foxes in his city. Survivors remain in grave danger. One simple, impactful thing we can do is email this Australian mayor, b.manning@cairns.qld.gov.au, politely asking him to stop all planned efforts to chase endangered flying foxes from their traditional homes in Cairns. They’re already desperate, and many more may die if forced to move.

A spectacled flying fox (Pteropus conspicillatus) pollinating a black bean tree (Castinoperum australis), a prized timber tree in Australia.

We must learn to live in harmony with nature! Please visit the link in our bio for more about climate change and flying foxes. Also, follow @sera_loves_crocs on Instagram as well as BATSOC (Bats and Trees Society of Cairns) @batsandtreessocietyofcairns, on Instagram and Facebook for further updates and details.

 

 

TAKE ACTION!

Our combined voices can make a difference. Send an email to Mayor Bob Manning to politely make him aware of international concern for Australia’s flying foxes. Cairns is a major tourist destination where potential visitors have extraordinary influence. He just needs to know you like flying foxes and hope to see them protected as some of his country’s most valuable and fascinating wildlife. It’s numbers that count. Australia’s flying foxes need all of you!

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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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So Many Birds…and Bats!

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!

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Partnership for Bat Conservation and Management Training

9/19/18
By Merlin Tuttle

John Chenger and Julie Zeyzus interviewing Merlin for training video on bat cave management.

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.

Teresa Nichta (left) and Julie Zeyzus shooting slow motion video of Brazilian free-tailed bat (Tadarida brasiliensis) emergence.

 

 

 

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.

Bad gate that caused abandonment by a large colony of cave myotis (Myotis velifer). New owners removed the gate, and the bats are now gradually returning.

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!

Measuring roost stains left by a formerly large colony of cave myotis in a Texas cave. Stains can last for centuries, providing an invaluable estimate of past colony size.

 

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.

 

 

 

 

Videoing Brazilian free-tailed bats close-up in crevices between box beams.

Explaining how bat-friendly bridge designs have aided Texas farmers.

Sunset emergence of free-tailed bats.

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Counting Free-tailed Bats in Bridges

9/10/18
By Merlin Tuttle

Merlin inspects Brazilian free-tailed bats (Tadarida brasiliensis) moments after removing them from their bridge crevice roost for counting.

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…)

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Bat-Friendly Bridges Help Farmers

Merlin Tuttle
9/12/18

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.

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Panel Discussion on Vampire Control

Wildlife Disease Association
St. Augustine, Florida
8/10/18
By Merlin Tuttle

The Wildlife Disease Association hosted a panel discussion on vampire bats (Desmodus rotundus), their impact, status, and changing distribution on August 5, 2018. A panel of six speakers from Europe, Mexico, and the U.S. were invited to speak. In the lead-off, tone-setting presentation,

Veterinarian and vampire control officer for Costa Rica, Dr. Hugo Sancho treating vampire bites with a mixture of Vaseline and warfarin to kill vampires that return to feed at the same wounds night after night. This kills only those that are causing problems.

I outlined the global value of bats, with special emphasis on Latin America, then proceeded to discuss my decades of observations on vampire control and the enormous damage done when beneficial species are inadvertently targeted. I favored control limited to the vampires causing problems. However, I emphasized that vampire problems are two-fold. One of course involves feeding on livestock and occasionally humans. The other involves their potential impact in crowding other species out of already declining roosting options. The dramatic expansion of vampire populations due to livestock introduction is likely impacting many other bat species that are essential to healthy ecosystems.

Yanomamo Indians living in remote rain forests of Venezuela.

During my early bat surveys in remote rain forests inhabited only by aboriginal Indians, I rarely encountered vampire bats. In fact, I do not recall ever having seen a Yanomamo Indian bitten, despite their habit of sleeping nude in lean-to shelters without mosquito nets. I first encountered significant numbers of vampire bats where Indians under European influence were keeping chickens, pigs, or other livestock. My anecdotal observations indicated that humans first became substantial targets when they began keeping pigs or chickens. Vampires became accustomed to feeding on these, and when they were slaughtered for feasts, the hungry bats turned to humans. Later when ranchers sold livestock, again suddenly reducing the food supply, vampires whose numbers had grown to depend on their herds, turned to people.

 

Only three species of vampires exist. All live only in Latin America, and only one, the common vampire, poses a significant threat to human interests. More than 350 other species are highly beneficial, keeping insect populations in check, pollinating flowers, and dispersing seeds.

A common vampire bat in Panama.

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Mosquito Eating in Bats

8/9/18
By Merlin Tuttle

For decades, bat biologists have debated the extent to which bats prey on, and potentially reduce mosquito populations. However, recent research suggests bats may be eating far more mosquitoes than yet suspected. Amy Wray and associates (2018) relied on newly refined techniques that provide greater sensitivity. In their paper, titled “Incidence and taxonomic richness of mosquitoes in the diets of little brown and big brown bats,” they reported that these common species eat a greater variety of mosquitoes, and catch them more frequently than previously suspected.

A little brown myotis (Myotis lucifugus) in Wisconsin. Just one of these bats can catch 1,000 mosquito-sized insects in a single hour.

They tested guano samples from 22 locations in a range of habitats, across the State of Wisconsin, from May 17 through July 29. Seventy-two percent of little brown myotis (Myotis lucifugus) samples contained mosquitoes representing 15 species, more than twice as many as big brown bats (Eptesicus fuscus). But even the larger big brown bats, previously thought to feed mostly on beetles and moths evidenced mosquito-eating in 33 percent of samples. Frequency of mosquito-eating remained constant throughout the active season in big brown bats but declined slightly in little browns.

Little brown myotis (Myotis lucifugus) from Tennessee.

A third of big brown bats (Eptesicus fuscus) in Wisconsin fed on mosquitoes.

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