The Bats of Selah
The Chiroptorium
"Bamberger's Folly"
Bat Researchers have been back to the ranch
August 1, 2005. Read the press release
Bamberger Bat News Flash
On
June 22, 2004, Dr. Gary McCracken, biologist and professor from the University
of Tennessee visited the Chiroptorium. After an evening emergence of Mexican
Free tailed bats that lasted about 5 minutes, the scientist and several staff
went into the interior of the cave and discovered that this colony is now
an official “maternal colony”. Dr. McCracken estimated about
a one-meter square on the ceiling of the back dome was covered in pups, which
he said would be about 5,000 babies. Also inside the cave is a large bat
house and it too is filled to capacity with pups. We can now confidently
announce that our Chiroptorium is a “success”! Dr. McCracken says
that the population will now explode and predicted that by August of this
summer we will have more bats than we did last year as more and more juveniles
will find the cave. There are still no plans to organize public viewings.
photo credit © Merlin D. Tuttle, Bat Conservation International
New Residents
Spring
2004, the 2nd grade class of Dripping Springs Primary School spotted this
Eastern red bat hanging on a Texas buckeye. This is very exciting as this
is the first time this species of bat has been identified on the ranch. Most
of the other bat visitors and residents are the Brazilian free-tailed bats
who roost in the Chiroptorium by the thousands.
Emergences
These images were taken in August 2003.
Bamberger's Folly is now Bamberger's Chiroptorium Success! (Updated June 2008)
Always a conservationist, J. David Bamberger was inspired to build his own bat cave on the Bamberger Ranch after years of volunteering with Bat Conservation International's Bracken Cave project. The awesome sight of millions of bats emerging nightly during the summer months from Bracken Cave outside of San Antonio would inspire even the weakest soul! J. David first looked for a limestone cave on his ranch to see if it could be properly excavated for bats. Finding nothing suitable, a site was chosen on the ranch that met several criteria: accessible for educational tours, and designed in a way that the guano could easily be extracted, once bats inhabited the site. (See the How to Build a Bat Cave - article from BCI web site chronicles the construction of the Chiroptorium. for more details). Plans are that once there is enough guano in the cave, we will use that as natural fertilizer on about 15 acres of improved pastureland. Once we begin using guano as opposed to chemicals, we will be able to certify our cattle as "organic", which translates into economic dollars.
Completed in 1998, the Chiroptorium is designed to house several hundred thousand Mexican Free-tailed Bats. For the first few years, bats came and went. Most seemed to be travelers; they would stay for a few days or sometimes for a few months. There was much early publicity, as everyone was anxious to report about this eccentric project and predict what the results might be. Each summer, journalists and reporters would call for an update, and J. David and the staff kept a good sense of humor about the small numbers.
Plagued with droughts, even the rural area caves reported smaller colonies. It seemed that nothing was working in our favor. Then in the summer of 2002, we noticed that several hundred bats came to the cave. There are three plate glass observation windows that would allow visitors to see bats at roosting height and each of those windows had smudge marks on them. We quickly figured out that as the bats circled to warm up before emerging from the cave, they were hitting the windows. So the staff did several things to the windows: we put black fabric on the exterior surface of some of the windows and we spray painted the interior of others.
We fine-tuned our efforts with the glass in the winter of 2003 by putting up plywood on the windows and replacing the fabric that had torn from the previous attempt. Bats came that spring. Estimating several thousand in the early summer months of 2003, we believed that we had found the solution and we were happy. Then on August 5, 2003, J. David went up to the cave before sun-down to view his "several thousand" and what he saw changed the whole picture: a huge number of bats were emerging from the cave, coming out in a column over the road and flying off into the night sky. Strong emergences regularly lasted 30 minutes each night. They stayed until the migration period back to Mexico in October. And we held our breath.
Bats have returned each spring. Each June new pups are born, In May of this year (2008) we had the Boston Researchers count our bats using infra-red video photography developed by Dr. Tom Kunz and his graduate students, and informed us that we had 116,000 bats at that time. We are excited about the size of our "Maternity Colony" of Mexican Free-tailed Bats.
Late in the summer when the pups are flying we will have several evening Bat Tours. Check our Tours and Workshop page for dates. We hope to see you at one of them!