As a hunting bat closes in on a flying insect, its echolocation calls get closer and closer together, and shorter and shorter in duration. The calls, more than 160 per second, give the bat rapid-fire information on the location of its ever-moving prey.

To the human ear, the calls register as one continuous sound. Researchers call it the “terminal buzz,” and until recently, scientists did not fully understand how bats produced it.

Bats use muscles in the larynx to produce sound, just like humans, but scientists had never found a mammal muscle that could turn on and off that quickly.

“You can tap your finger on a table, and you can try to tap your finger as fast as you possibly can,” said Andy Mead, a biology graduate student at the University of Pennsylvania. Eventually, your muscles seize up and you can’t tap any faster, Mead said. “You can probably tap five, six, seven times a second if you really try.”

As part of a research team led by Coen Elemans from the University of Southern Denmark , Mead found muscles in a bat larynx that could turn on and off in less than one one-hundredth of a second, firing up to 180 times a second.

“It was instantaneously really shocking and exciting to see yes, this is a very, very fast muscle,” Mead said.

The discovery marked the first evidence of a “superfast” muscle in a mammal. Superfast muscles are responsible for the rattle of a rattlesnake and the mating call of the bottom-dwelling toadfish and some songbirds, but the discovery of the muscles in mammals leads researchers to believe they may be more common than they thought. They are also key to the evolutionary success of bats, which are the only flying mammals to use echolocation to hunt.

See the original story from our partners at WHYY.

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‘Superfast’ Muscles Help Bats Find Their Dinner 10 November,2011Carolyn Beeler


Carolyn Beeler

Carolyn Beeler is a health and science reporter at WHYY in Philadelphia. She studied print journalism but caught the radio bug as a Kroc Fellow at NPR. Her work has taken her to the bottom of a bat cave and the middle of a jellyfish-infested bay, and her pieces have aired nationally on Morning Edition, All Things Considered and Weekend Edition. She has worked as a journalist in Chicago, Washington, D.C., Seattle and Cape Town, South Africa. Carolyn studied journalism at Northwestern University.

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