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This is Scientific Americans' 60- Science. I'm Karen Hopkin.

Bats use echolocation to hunt for their meals, and moths are often on the menu. But in the

acoustic arms race between predator and prey, moths also have a trick or two up their sleeve,

or actually, on their wings. Because a new study shows that moth wings are covered with scales that absorb sound,

particularly the ultrasonic variety preferred by bats. So moth and butterfly wings are covered in

layers of scales. These are made of a naturally occurring polymer called chytin,

which is a polymer that you find in most insectin crustacean exoskeletons.

That's Thomas Neal of the University of Bristol.

He started out by bombarding bits of moth wings with sound,

and seeing what bounced back.

We discovered that moth scales actually resonate in response to being hit with ultrasound,

and they resonate at frequencies that pretty much perfectly match the frequencies that bats

use for echolocation.

That vibration converts sound energy to mechanical energy, which muffles the echo that gets back to the bats.

That probably hasn't happened by accident that these scales are such a shape and size that

they're resonating at just the right frequencies that they could absorb sound energy from hunting

bats.

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