Awesome X-Ray Videos Reveal How Bats Take Off And Fly

I had my first experience with bats over 20 years ago in the tiny village of East Coker, in the southwest of England. Unfortunately, it wasn’t a very good one!

I had gone to East Coker in search of the burial place of T.S. Eliot, the American poet who made his home in England and immortalized this quaint village in “The Four Quartets.” I entered the deserted graveyard, walked up to the 12th century church of St. Michael, pushed the door open and screamed. A swarm of bats, dozens of them, screeched past me, flapping their wings and escaping into the warm summer evening. It was several minutes before I regained my composure, entered the church and found the burial plaque I was looking for.

Despite this unpleasant introduction, I later began wondering how these fascinating creatures — which are mammals, not birds — can muster the energy to take off and fly out so quickly. Indeed, it was both the unexpectedness of finding bats, as well as their rapid exit, which unnerved me.

Bats are the only mammals capable of free flight, able to launch into flight from a still position.

There are other types of gliding mammals, such as flying squirrels, flying lemurs and numerous varieties of gliders. But unlike bats, these creatures must launch from a high point in order to glide to a lower point. So they are really jumping animals.

So how do bats manage to take off and fly?

A team of biologists at Brown University recently decided to investigate exactly how bats manage to be the only mammals truly capable of sustained flight.

Using XROMM (X-ray Reconstruction of Moving Morphology), they took ultra high-speed X-ray videos of Seba’s short-tailed bats (i.e., fruit bats) as the creatures lifted themselves off the ground and discovered that their extra-stretchy biceps and triceps tendons are crucial for storing and releasing the energy needed for takeoff.

VIDEO: X-Ray of a Bat Taking Flight

Their analysis, which they presented on July 5 at a meeting of the Society for Experimental Biology, showed that the bats first stretch out the tendons that anchor their biceps and triceps muscles to their bones, and then compress the tendons to release energy and power their flight upward.


This finding was confirmed by another innovative method of studying the fruit bat’s anatomy in motion: a technology called fluoromicrometry, in which chemically labeled markers are injected into the animal’s muscles. These let the researchers directly measure changes in the length of the muscles during contraction and expansion as part of flight. Calculations showed that energy output associated with the changes in muscle length alone couldn’t provide enough power for flight, further pointing towards the role of stretchy tendons.

The discovery comes as something of a surprise to biologists, who previously believed that small mammals have tendons that are too stiff and thick to be stretched at all. But this capability, and their associated ability to fly, provides further evidence that bats are truly unique among their kind.

Bat wings are of course very different from bird wings. And now we know exactly how those bat arms, elbows and very long finger bones connected by two layers of thin skin operate. Bat thumbs, by the way, are separate little claws that help with climbing.

Of course, bats are great friends of farmers, since they eat insects that can destroy vegetable and fruit crops. A single brown bat can eat up to 1,000 mosquitoes an hour.

I suppose I didn’t need to worry on that summer night; any bat flying towards me was probably only interested in snacking on the mosquitoes or moths hovering around my head.

VIDEO: A Bat Flies in Super Slow Motion

Photo Credit: thinkstock


Carrie-Anne Brown

thanks for sharing :)

Sheila Casey
Past Member 4 years ago

wonderful article: well written, educational and exciting! keep up the good work and especially write more on bats for they are very important but unfortunately declining rapidly in many areas.

greenplanet e.
greenplanet e4 years ago

Very fascinating.

Suzanne B.
Suzanne B4 years ago

thank you for sharing this!

Berny p.
berny p4 years ago


Jen S.
Jen S4 years ago

Fascinating article. I'll pay more attention when the bats in my little hobby bat house leave at night-it isn't a mass exodus but there are more every year. You would be amazed at how many mosquitoes they consume. Thanks for posting!

Mostapha Zaher
Mostapha Zaher4 years ago

Wonderful and very educative article. If more people bothered to learn about wildlife, they will soon overcome their fears. Bats have, historically speaking, received a negative image.

Bats represent about 20% of all classified mammal species worldwide, with about 1,240 bat species divided into two suborders: the less specialized and largely fruit-eating megabats, or flying foxes, and the more highly specialized and echolocating microbats. About 70% of bats are insectivores. Most of the rest are frugivores, or fruit eaters. A few species, such as the fish-eating bat, feed from animals other than insects, with the vampire bats being hematophagous.

Historical negative publicity aside, which held due to ignorance, bats are present throughout most of the world, performing vital ecological roles of pollinating flowers and dispersing fruit seeds. Many tropical plant species depend entirely on bats for the distribution of their seeds. Bats are important in eating insect pests, reducing the need for pesticides.

Seba's short-tailed bat (Carollia perspicillata) is, thankfully, on the IUNC's least concern mammals. Nevertheless, their habitats must be protected in order that they thrive and continue to be a robust part of the species of mammals who actually protect nature.

Thank you Judy Molland for your enlightening article.

With best wishes to all Care2 members who are reading this,


Kabul - Afghanistan

Giana Peranio-paz

I love bats!

Jeanne Rogers
Jeanne Rogers4 years ago

Thank you for getting the info out there.