Checkin in
You doin ok in your log Zonker? Just checkin, good bat.
rescue release
Seabreeze & North Front
Great night for Central Texas bats as a strong seabreeze pushes moths toward the Hill Country while a North front brings reverse migrating moths back from the northland, making a smorgasborg for Mexican free-tailed bats fattening up for their own migration south at the end of the month. This year’s pups are packing on the grams preparing for their first big journey. Their is a lot going on in this video as the Hill Country roosts are perfectly situated to take full advantage of both fronts.
Here’s the Congress Avenue Bridge bats that same night going with the seabreeze to the NW, to feed on moths pushed along on the leading edge of the front.
Serious Visitor
This eastern screech was so focused on our bats, that he allowed us to approach to within 6 feet before finally flying off! The rehabilitating bats are working on their flight skills and for that reason, they attract even more attention from local owls.
Our Mexican free-tail Bernie has a permanently injured wrist but was roaming the flight cage last night. But for the netting, he would have been scooped up in an instant by this owl.
Happy free-tail
This free-tail is so happy to be flying again and catching moths around the blacklight!
Soon to be back in the wild skies.
Just look at that smile!
Toe whiskers
Here’s an angle rarely seen of a Mexican free-tailed bat. If you look closely you can see the long “whisker” hairs sticking out between the toes. “Kind of like you honey” a bridge visitor said to his girlfriend this summer, right before she hit him, hard.
Built for Speed
Mexican free-tailed bats are built for speed. Their long narrow wings are just one of the adaptations that rank them among the fastest bats.
They are, however, also remarkably agile in tight spaces. They use bone structure and muscle fibers to change their wing aspect ratio to short and broad, allowing high maneuverability when necessary.
Moth mystery
We’ve always wondered why every morning we find whole moths floating in the water of the drinking trough, in the bat garden. These are whole moths, not just the wings we would expect to find, when bats catch the moths, shuck the wings, and eat the rest.
So why so many whole, often live, moths in the water?
Here a Seminole bat controls a moth
Last night we finally got proof of what we suspected to be the reason.
We have a blacklight that attracts insects into the garden. It hangs from the center ridge of the aviary and is directly over the drinking pool. The pool is also situated in the center so that it collects the drips from the misters, which are also hung from the center ridge.
Our flight school bats fly in wide circles that are tangent to the light, so that they can catch any moth that happens to be flying at the wrong place at the wrong time. When they catch one, they curl up into a ball as they fly, to control the moth and bring it up to their mouths.
If one watches a moth circle under the light, within seconds a bat will zoom in and snatch the moth.
Last night we watched while evening bats did just that. 
But in between catches of fluttering moths, we noticed times where moths we were watching, just before a bat swooped in, would fold their wings and plummet downwards, splash-landing in the pool!
We have often heard of moths evolving defenses to counter the amazing bio-sonar the bats employ to hunt them. This arms race has been going on since bats developed echolocation around 25 million years ago, and has manifested in countless ways ever since. Some moth species have it hard-wired in their DNA that, upon hearing bat bio-sonar, their synapses fire in such a way that paralyzes their wings, causing them to plummet downward, away from the bats closing trajectory. This seems to work quite well, unless the moths just happen to be over our bat drinking trough!
So now we know why so many moths are found each morning in the pool! We just may move the light location so that these moths land in the garden instead, and rise once more to provide additional foraging opportunities for our bats as they hone their hunting skills. This will be a big benefit when we have a full house of bats in flight school, with not enough moths to go around.
We love these little insights that nightly observation provides in the aviary!
Archie!
This Mexican free-tailed pup was found 17July2016 under Congress Ave Bridge. This was the first day the skypuppies took flight this year and it seems a mid-air collision grounded him on the footpath. Bat watchers correctly refrained from handling him and when they alerted us, we brought him back to our facility for care. We discovered that his forearm was curved in a manner reminiscent of the arches of the bridge, so of course he was named Archie and we expected he would likely not become volant. To our delight, he was not to be denied the joys of flight! We left his pup tent open to the flight cage and he bravely joined all of this year’s pups in the aerial circus that resembles a nightly fighter jet dogfight. He also flits around in the afternoon gliding like a butterfly before cleverly finding his way back to the pup tent for snacks!
We will closely monitor his skills to see if he is up to the fall migration, if not he’ll stay with us and enjoy hunting moths in the bat garden. Good pup Archie!
Free-tail release
This bat had fallen into a back-porch bucket during all the rains last week. She managed to tread water ’till morning, when Matt & Christina found her and rescued her. We made sure her thumb claws were not damaged (luckily it was a plastic bucket), and then brought her out to the flight cage to make sure she could sustain flight. We tried a non-toxic tempura paint to ID her (it’s messy if they struggle and swat the paint brush) and you can still see a hint of red on her left ear as she is released back into the wild. Good bat, nice knowing you!
Leaf bat release
What a great release last night! Such a joy to see them leap from the pup tent and circle above us in the twilight! We’ll miss their nightly insect hunting competition in the flight cage, but our hearts and minds go with them as they soar the night skies, ranging as high and wide as their hearts desire, flying wild and free! Indelible memories little bats, thanks so much!
Oh and your’re not quite ready to go yet sweetheart? Then you can stay with us, we’ll try again later.
