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Public Radio's Environmental News Magazine (follow us on Google News)

Science Note/Bat Aerodynamics

Air Date: Week of

Bats fly through the air with the greatest of ease and new research shows that their flight is regulated by sensitive hairs on its wings. Stephanie McPherson reports.



MCPHERSON: Bats flit across the night sky in a rapid ballet of twists and turns. Now,
researchers believe the bats agility is due to the tiny hairs on their wings.


MCPHERSON: The hairs on bats’ wings bend in the breeze and trigger super-sensitive
cells that help them register the speed and direction of the wind.

Scientists from the University of Maryland measured electrical firings from the bats’
brains as they responded to the signals coming from the sensor cells. The brains were
most active when they sensed the wind coming from behind – a situation that could lead
to stalling.

The researchers wanted to know how the bats put those signals to use. The mammals
flew through obstacle courses - first with their hairs in tact, then again after the hairs were
removed using a topical cream.

The bats moved easily through the course during the first round. But when their wings
were hairless, the bats flew faster and took wider turns. Since the hairs weren’t there to
trigger the sensor cells, scientists believe the bats sped up to avoid dropping from the sky
– in the real world, they would’ve had trouble catching prey or avoiding predators.

Researchers are looking into how they can use this information to improve wind sensors

on airplanes. Perhaps they can prevent stalling with a wing and a hair. That’s this week’s
Note on Emerging Science, I’m Stephanie McPherson.



Bat hair research at the Institute for Systems Research, University of Maryland


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