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This is Scientific American's 60 Second Science. I'm Suzanne Bard.

What do you call a bat that only eats fruit but isn't classified as one of the fruit bats?

One species that fits that description is thought to live in forests from southern Mexico to the north end of South America.

But they're so rarely seen that very little

is known about them, apart from their unique appearance, which is why the species is called

the wrinkle-faced bat.

Many people say that these bats are really ugly, but the word ugly is for bad biologists

a forbidden word.

So I think we all agree that they are pretty

special-looking bats. University of Ulm researcher Marco Chopka, his colleague Gloria Gessinger, agrees.

Most bats look like cute little puppies, but they have a very wrinkly face, and it's just

a lot of wrinkles everywhere.

But something else about the males may be an even more unusual facial feature.

It's very easy to distinguish between male and female because the males have this funny face mask.

Using their little bat thumbs, males can pull up a furry flap of skin to cover their

faces like a mask. The bat almost tries to hide its entire face inside of the mask, and people have

suspected for a long time that these masks have something to do with mating. But the bat's courtship is difficult to study because they're so hard to find.

...