Published On: 10.31.21 | 

By: 13299

Bats: Dangerous, blind bloodsuckers or helpful, biological pest control?

Rafinesque’s big-eared bat is one of 16 species of bats in Alabama. Three of the species, but not this one, are on the U.S. Fish and Wildlife Service's Endangered Species list. (J.C. Abbott)

Night falls.

A thick, black curtain of darkness envelops the sky. The air is still and silent.

Suddenly, a creature with long, disproportionate claws with flaps of veiny skin between its fingers appears in the air, flapping its dark-colored skin-wings swiftly.

A shimmer of light gleams off the glistening, prominent, curved fangs in its agape maw.

Blood.

Blood is what it’s after, right?

No, human blood is not what bats feed on, said John Abbott, chief curator and director of the Department of Museum Research and Collections at the University of Alabama.

The Mexican free-tailed bat. Bats sometimes get an undeserved bad reputation but are overwhelmingly beneficial animals, said the University of Alabama’s John Abbott. (J.C. Abbott)

Bats are found all over the world, but only two types that range in the tropics are blood-feeders. Abbott said the bloodsucking rumor has caused bats to gain a bad reputation, but they’re really one of the most helpful mammals in existence.

“There are only four groups of organisms that have ever taken flight in our history,” Abbott said. “Pterodactyls, which are extinct, birds, insects and bats, which are the only flying mammal.

“Bats are of an incredible benefit to us. Bats often feed on insects like moths and beetles, many of which are pests that eat crops.”

As the world gears up for Halloween, people across the globe and in Alabama are pausing to recognize the beauty and importance of this furry, flying critter during Bat Week, which runs through today.

Abbott said there are 16 species of bats in Alabama, three of which (gray myotisare, Indiana myotis and Northern long-eared myotis) are on the U.S. Fish and Wildlife Service’s Endangered Species list.

For the most part, these nocturnal mammals stay out of people’s way, so encounters with them are rare. The occasional bat in the attic does occur, however.

Bats harbor many diseases, Abbott said, but they’re unusual in that they rarely become sick themselves. Some species are being affected by white-nose syndrome, a fungus that’s afflicting and killing bat populations in Alabama and the eastern U.S., particularly cave species that hibernate in large numbers together.

White-nose syndrome doesn’t affect humans, but it does have an impact on people because it devastates bat populations, which in turn affects insect populations. Research is ongoing in Alabama and across the country and the world to find a cure for white-nose syndrome. Alabama Power and its parent Southern Company are among those supporting bat and white-nose syndrome research.

Abbott said rabies can also be a concern with bats. Most bats don’t have it, but some do.

“If you see a bat during the day on the ground, don’t touch it because it could have rabies,” Abbott said. “That’s rare, though. They’re harmless to us other than rare scenarios like that.”

Another misnomer about bats is that they’re blind. Abbott said they can see, but sight isn’t the main way they hunt their prey.

Like dolphins, bats use echolocation through chirps issued from their nose or mouth that bounce off the environment to help them determine the speed and density of objects so they can figure out what are viable prey items.

“What’s neat is that some moths have developed a way to detect bats’ echolocation so they can avoid getting eaten by them,” Abbott said. “So, they’re in an evolutionary race to out-compete one another.”

Abbott said since bats fly with their elongated fingers and not their arms, they fly differently than birds.

“They’re very acrobatic fliers,” he said. “Bats swim through the air.”

Abbott said one of the unique bat species in Alabama is Rafinesque’s big-eared bat. The reason is in its name. It has giant ears, almost like rabbit ears. They roost in abandoned houses and similar places.

This story originally appeared on the University of Alabama’s website.