7 Myths About Bats

iStock
iStock

Though in China bats are said to bring good luck, and ancient Egyptians believed they could cure an array of diseases, our feelings about bats are often negative. Perhaps these rumors started because bats are so mysterious—with their nocturnal flying and dank, dark habitats, they’re hard to study! But the world’s only flying mammal isn’t nearly as bad as our fears make it out to be. Keep reading for seven misconceptions, as well as explanations of what really goes on in the batcave.

1. BATS ARE TOTALLY BLIND.

Though we love to talk about things being "blind as a bat," bigger bats can see up to three times better than humans, according to Rob Mies, executive director of the Organization for Bat Conservation. Bat vision varies across species, but none are actually blind. In addition to working peepers, bats also use echolocation (emitting sound to navigate)—which means they probably have a better idea of where they’re going than many of us.

2. BATS ARE FLYING RATS.

Bats belong to the order Chiroptera, not Rodentia; they’re actually more closely related to primates than they are to rodents. They also don’t share behavior with rodents. For example, bats don’t chew on wood, metal, or plastic, and usually aren’t nuisances. In fact, bats eat pests, which brings us to ...

3. BATS ARE ANNOYING PESTS.

Bat flying in a forest at night
iStock

Quite the opposite! According to National Geographic, bats can eat up to a thousand insects in an evening. Their bug-eating prowess is so notable it carries economic importance. A recent study showed that bats provide “nontoxic pest-control services totalling $3.7 billion to $53 billion per year”! Bats also pollinate plants and distribute seeds, and their droppings—called guano—are used as fertilizer.

4. BATS WANT TO DRINK YOUR BLOOD.

Only three of the roughly 1200 existing bat species are vampire bats, and none of them live in the United States or Canada. Vampire bats don’t even really drink blood—Mies says the feeding process is more like that of a mosquito. While mosquitos will take blood from humans, though, vampire bats primarily feed on cattle. Fun fact: a medication called draculin is currently being developed from bats’ saliva, which has unique anti-blood-clotting properties.

5. BATS WILL FLY INTO YOUR HAIR AND BUILD A NEST.

An old myth claims that bats fly into hair, get stuck, and build nests. While it’s possible this rumor started to deter young women from going out at night, bats do sometimes swoop around people’s heads. The reason isn’t because they’re shopping for a new home, however: our bodies attract insects, and bats are after their next snack. So don’t worry—your spectacular updo is safe.

6. IN FACT, BATS DON'T NEST AT ALL.

Unlike birds or rodents, bats don’t build nests. Instead, they find shelter inside existing structures. Caves, trees, walls, and ceilings are favorites, as are rafters of buildings. They don’t always hang upside down, either. According to Dr. Thomas Kunz from Boston University, bats are frequently horizontal when roosting in small crevices, not vertical.

7. BATS WILL ATTACK YOU AND GIVE YOU RABIES.

Three bats hanging upside down on a branch
iStock

Nope. Shari Clark, president of the Florida Bat Conservancy, says that statistically bats contract rabies much less frequently than other mammals. And if they do get rabies, it manifests differently than in raccoons or foxes. Rabies-infected bats become paralyzed and can’t fly or roost. This means that as long as you stay away from bats on the ground that are behaving weirdly, you’re pretty much in the clear. Phew.

All photos courtesy of iStock.

Why You Should Never Squish a Stink Bug

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iStock.com/drnadig

Commit the insect you see above to memory. That’s the brown marmorated stink bug, an invasive species originally from Asia that’s made inroads across large sections of the United States, including the Mid-Atlantic.

If you come across one, don’t squish it. In fact, don’t even nudge it. A stink bug’s pestilence can survive after death. And you can probably guess how.

According to The State, stink bugs release a secretion that smells absolutely awful when they’re disturbed or feel threatened. Stomping them just expedites the liquid. Those who have had the unfortunate opportunity to get a whiff have described it as resembling skunk odor or rotten cilantro.

In winter, the bugs tend to find their way indoors, where their half-inch bodies tend to catch the eye of homeowners. Fortunately, they’re largely harmless, and are not known to carry diseases or be destructive to pets or property. (Crops are an exception: The stinkbugs can prove damaging to agriculture.) While exterminators can treat houses, some recommend just ignoring them.

If you want a DIY approach, you can try vacuuming them up or leaving out trays with soapy water. The mixture will kill the bugs and minimize any post-mortem secretion.

Since the bugs were first spotted in Allentown, Pennsylvania around 1998, they’ve been spotted in 43 states. Generally, you probably won’t see more than a few in your home, though they’ll definitely congregate if conditions are right. One wildlife biologist in Maryland suffering from an infestation counted 26,000 stink bugs in his residence.

The good news? Scientists have determined that the stinkbug’s natural predator, the samurai wasp, is in hot pursuit. Entomologists at the U.S. Department of Agriculture had made plans to bring the wasp over from Asia to help control the bug population but discovered in 2014 that the wasp had somehow made the journey on its own. Their idea of population control is injecting their own eggs into a stinkbug’s, its larvae eating the pest. The parasitic wasp is in 10 states and climbing.

[h/t The State]

New Study Reveals 'Hyper-Alarming' Decline of Rainforest Insect Populations

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iStock/jmmf

Climate change is decimating yet another vital part of the world's ecosystem, according to a startling new paper. Rainforest insects are dying off at alarming rates, according to a new study spotted by the The Washington Post. In turn, the animals that feed off those insects are decreasing, too.

In the study, published in Proceedings of the National Academy of Sciences, a pair of scientists from the Rensselaer Polytechnic University in New York and the National Autonomous University of Mexico studied populations of rainforest arthropods (an invertebrate classification that includes insects and spiders) in the El Yunque National Forest in Puerto Rico. They compared the number of insects lead author Bradford Lister found on trips in 1976 and 1977 with the number he and co-author Andres Garcia found on trips they took between 2011 and 2013.

Lister and Garcia used nets and sticky traps to collect insects on the ground and several feet above the ground in the forest canopy. They dried these captured bugs and measured the mass of their haul against the mass of insects found in the 1970s, finding that the modern net sweeps captured only an eighth to a fourth of the insects captured in the '70s. The mass of insects captured by sticky traps on the ground declined by 30 to 60 times what they were a few decades ago. They also tracked populations of lizards, frogs, and birds that live off those rainforest insects, finding that those populations had declined significantly, too, at levels not seen in other rainforest animals that don't rely on insects for food.

Tropical insects are particularly vulnerable to climatic changes, since they can't regulate their body temperature. During the time of the study, average maximum temperatures in El Yunque rose by almost 4°F (2°C). The warming climate is "the major driver" of this decline in arthropod populations, the study authors write, triggering a collapse of the forest food chain.

The paper has other scientists worried. "This is one of the most disturbing articles I have ever read," University of Connecticut entomologist David Wagner, who wasn't involved in the research, told The Washington Post, calling the results "hyper-alarming." Other studies of insect populations have found similarly dire results, including significant declines in butterflies, moths, bees, and other species. One recent study found that Germany's flying insect populations had decreased by as much as 75 percent in the last three decades. Scientists don't always attribute those population losses directly to warmer temperatures (habitat loss, pesticide use, droughts, and other factors might play a role), but it’s clear that insect populations are facing grave threats from the modern world.

Not all insect species will be equally affected by climate change, though. While we may see a sharp drop in the populations of tropical insects, scientists project that the number of insects in other regions will rise—leading to a sharp increase in crop-eating pests in some parts of the world and broadening mosquitos' geographical range.

[h/t The Washington Post]

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