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This is Scientific Americans' 60-second Science. I'm Jason Goldman.

The little brown bat was once abundant in the eastern U.S.

But within the last 15 years, a fungus called pseudogynobnoascus destructans

infiltrated a cave in upstate New York. This fungus causes what's called white nose syndrome in bats.

The illness has now spread throughout North America, causing widespread bat die-offs.

But recently, little brown bats in New York have stopped declining. In fact, their numbers are

actually going back up. That was exciting, but we had no idea how these bats were persisting with the

disease. Harvard University epidemiologist Kate Languig. Little brown bats during the fall

swarm around hibernaculate entrances, and during that time period they're active, and they're

feeding and fattening for winter., they also mate during that time period.

Then they go into hibernation,

and that's really when infection peaks.

Winter is sort of the time period in which

white-nose syndrome is happening to bats.

To understand how the New York bats were surviving,

Languagher team compared them to bats from Illinois and Virginia in colonies

that are still experiencing the initial mass die-offs. They wanted to see whether the New York

...