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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Just as we humans understand the shape of our surroundings by how light reflects off objects,

bats use reflections of sounds they produce instead, what's called echolocation. But despite

their excellent sensing abilities, one type of obstacle vexes the animals, smooth,

vertical surfaces, like windows, because windows reflect almost all the bats calls away from

the bats at an angle, creating the illusion of empty space.

To better understand it, you can actually use a visual analogy.

Stefan Greif, a sensory ecologist at the Max Planck Institute for Ornithology.

Imagine standing in a dark room, he says, beside a mirror.

And that if you take a flashlight into your hand and shine it from the side onto this

mirror, you would see that all the light is being reflected away.

You would see it on the other side of the wall.

So even visually, this would look to you like there's a hole

in the wall. There's nothing coming back from this place. Light wouldn't come back to you unless you

aimed the flashlight more or less perpendicular to the mirror. And same for bats and their calls.

This perceptual glitch meant that in lab tests, 90% of the bats banged into a smooth vertical

surface. And by the way, the researchers

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