White-Nose Syndrome in bats:
Something is killing our bats

Credit: Nancy Heaslip, New York Dept. of Environmental Conservation

Little brown bats with white-nose syndrome, New York

Credit: courtesy of Cal Butchkoski, Pennsylvania Game Commission More maps

In February 2006 some 40 miles west of Albany, N.Y., a caver photographed hibernating bats with an unusual white substance on their muzzles. He noticed several dead bats. The following winter, bats behaving erratically, bats with white noses and a few hundred dead bats in several caves came to the attention of New York Department of Environmental Conservation biologists, who documented white-nose syndrome in January 2007. Hundreds of thousands of hibernating bats have died since. Biologists with state and federal agencies and organizations across the country are still trying to find the answer to this deadly mystery.

We have found sick, dying and dead bats in unprecedented numbers in and around caves and mines from Vermont to Virginia. In some hibernaculum, 90 to 100 percent of the bats are dying.

While they are in the hibernaculum, affected bats often have white fungus on their muzzles and other parts of their bodies. They may have low body fat. These bats often move to cold parts of the hibernacula, fly during the day and during cold winter weather when the insects they feed upon are not available, and exhibit other uncharacteristic behavior.

Despite the continuing search to find the source of this condition by numerous laboratories and state and federal biologists, the cause of the bat deaths remains unknown. Recent identification of a cold-loving fungus could be a step toward an answer.