9 Myths About Bed Bugs, Debunked

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No one would blame you for being afraid of bed bugs: They infest our most private spaces and feed on us when we’re vulnerable. But once you dispel the common myths surrounding the insects, they suddenly seem a lot less scary. Here’s what you need to know about how dangerous bed bugs really are, where they like to hide, and the best ways to get rid of them.

1. MYTH: THEY SPREAD DISEASE.

Someone holding a vial containing two bed bugs on a white piece of paper.
STAN HONDA, AFP/Getty Images

If you have a bedbug infestation, you’ll feel itchy, have trouble sleeping, or develop an allergic reaction to the bites. The psychological toll bed bugs take on people is also a real issue: Research has found that it’s common for people living with bed bugs to experience anxiety, depression, and paranoia. But compared to other blood-suckers like ticks and mosquitoes, bed bugs aren’t dangerous—they aren't known to spread any diseases to humans.

2. MYTH: THEY’RE TOO SMALL TO SEE WITH THE NAKED EYE.

An engorged bed bug feeding on a person.
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If you’ve examined every inch of your mattress and still can’t find any unwelcome insect guests, you can relax a little bit: You would have likely seen any bed bugs that were lurking in the fibers (unless they're hiding somewhere ... more on that in a bit). It’s true that bed bugs are small—about the size of an apple seed—but they’re not so small that it’s impossible to see them with the naked eye. They’re normally flat, but when they’re engorged they’re even easier to spot. “When they are fed they look plump, like little sausages,” Virna Stillwaugh, an entomologist and pest control specialist who researched bed bugs at North Carolina State University, tells Mental Floss. But experts caution that bed bugs are difficult to distinguish from many other insects, so it’s best to get an expert for a positive identification.

3. MYTH: THEY ONLY LIVE IN BEDS.

An unmade bed.
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The bed bug's namesake may be its creepiest hangout spot, but it isn’t the only place they're likely to lurk. They can be found in the folds of curtains and laundry and the seams of couches and chairs. Their hiding place doesn’t even need to be fabric: They’ve been known to settle into drawers, wallpaper, electrical outlets, and even the heads of screws. It’s for this reason that any kind of free furniture, not just beds, you see out on the street should almost always be left alone.

4. MYTH: THEY ONLY COME OUT IN THE DARK.

A light shining on a bed and two pillows.
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Keeping your lights on all night won’t stop the bed bugs from biting. As long as the little pests are hungry, they’ll crawl out of their hiding places to feed, no matter how bright it is in your bedroom. The myth that bed bugs don’t like light may have originated from the fact that they’re nocturnal, and therefore more active at night. Don’t use this as an excuse to change your sleeping schedule, however, as they can bite at anytime.

5. MYTH: YOU CAN RECOGNIZE THEIR BITES.

A man pointing to bed bugs feeding on his arm.
STAN HONDA, AFP/Getty Images

Don’t depend on a telltale bite mark to alert you to the presence of bed bugs. People react differently to bed bug bites: They can come in various sizes, include irritated rashes, or produce no rash at all. A cluster of red marks where multiple bugs were biting exposed skin is one common sign to look out for, though the evidence isn’t always this obvious. Some bites don’t leave a mark or leave one that’s barely visible, allowing the parasites to feed discreetly for days.

6. MYTH: THE BEST WAY TO KILL THEM IS WITH RUBBING ALCOHOL.

A bed bug on a piece of cotton.
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One especially misguided myth suggests using rubbing alcohol as a DIY bed bug control method. But it turns out this isn’t very effective: In one bed bug study, rubbing alcohol only killed half of its intended targets. And on top of that, dousing your furniture in rubbing alcohol also turns it into a fire hazard. People employing this tactic have started several house fires in the U.S. over the last decade.

7. MYTH: YOU CAN GET RID OF THEM ALONE.

A man holds a leashed beagle that is sniffing a bed for bed bugs.
Justin Sullivan, Getty Images

Unless you’re an exterminator, never try getting rid of bed bugs on your own. Bed bugs are starting to develop resistance to certain pesticides, so even blasting them with harsh chemicals you bought from the store may not be enough to stop them. It usually takes a combination of factors, including heat and fumigation, to completely rid an infested home of bed bugs. “This is one of the things that’s not do-it-yourself,” Stillwaugh says. “It’s best left to professionals.”

8. MYTH: THEY’RE ATTRACTED TO DIRT.

A person cleaning a table top with spray and a cloth.
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Bed bugs are are often associated with dirty places, but in reality they couldn't care less about the cleanliness of your home: What they’re really looking for is heat and carbon dioxide, something every human being emits regardless of how they live. “Bed bugs have been found everywhere from high-end hotels to apartments and shelters,” Stillwaugh says. It is true that bed bugs have an easier time infesting disorganized homes, but that’s because the clutter gives them more places to hide and not because they’re attracted to filth.

9. MYTH: THEY CAN FLY.

An illustration of a giant bed bug shadow looming over a bed.
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Good news: Outside of your nightmares, bed bugs can’t fly. The tiny insects have no wings with which to swoop down upon their victims. They’re also incapable of jumping great distances—unlike their fellow parasite, the flea. If they want to get somewhere, they have to crawl there.

Dream Job Alert: You Can Live and Work in Yellowstone National Park This Fall

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iStock/haveseen

Geysers. Charismatic wildlife. Camping. A supervolcano. Yellowstone National Park is home to so many things to see and do that you’d practically have to be embedded there to experience it all. Now, some will have a unique opportunity to live and work on the grounds this fall.

For the past year, the Helping Hands program at the park has recruited applicants to stay at one of the Yellowstone National Park lodges run by the Xanterra Travel Collection. The program offers part-time, short-term park jobs for people seeking to explore Yellowstone in greater depth. Workers spend about 20 hours a week working food service, housekeeping, and other duties and are able to stay in low-cost dorm-style accommodations. Meals are provided for a small biweekly fee. The rooms don’t have many amenities—there’s no television and Wi-Fi is slow—but you certainly won't be at a loss for things to do.

The five-week program begins for two groups on September 5 and 12 and lasts through October 15. In addition to lodging, workers also receive a $10.10 hourly wage. You can submit an application at the Yellowstone National Park Lodges website.

5 Terrifyingly Huge Spiders

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iStock/clauselsted

This week, woman in Tasmania came upon a massive huntsman spider devouring a pygmy possum at a lodge in the island's Mount Field National Park. The alarmingly huge arachnid was at least the size of a grown man's hand, and it's not the only giant spider out there. The enormous spiders below can’t be dispatched by a shoe or a rolled-up newspaper. They're sure to give you nightmares—even if you're not an arachnophobe.

1. Poecilotheria rajaei

Poecilotheria rajaei, a huge spider native to Sri Lanka
Ranil Nanayakkara/British Tarantula Society, Wikimedia Commons // CC BY 3.0

This species of tarantula, discovered in northern Sri Lanka in 2013, has a leg span of 8 inches. That's roughly the size of your face! It’s part of an arboreal group called tiger spiders, which are indigenous to India and Sri Lanka. A dead male specimen of P. rajaei—which is distinguished from other tiger spiders by the markings on its legs and abdomen—was first presented to scientists in October 2009 by a local villager; a survey of the area revealed enough females and juveniles that scientists are confident they've found a new species. “They are quite rare,” Ranil Nanayakkara, co-founder of Sri Lanka’s Biodiversity Education and Research, told WIRED. “They prefer well-established old trees, but due to deforestation the number have dwindled and due to lack of suitable habitat they enter old buildings.” P. rajaei was named after a police officer who helped scientists navigate the area where it was found.

2. Theraphosa blondi

A Goliath bird-eating spider
universoaracnido, Wikimedia Commons // CC BY-SA 2.5

Though Theraphosa blondi is called the Goliath bird-eating spider, it doesn’t actually eat birds. Reportedly, it got its name when an explorer saw it eating a hummingbird, but like other tarantulas, its diet consists mainly of insects, frogs, and rodents. But we’ll forgive you if you’re not comforted by that fact. After all, this spider can have a leg span nearly a foot across—the size of a dinner plate—and weigh up to 6 ounces, making it the largest spider in the world by mass. Its fangs, up to an inch long, can break human skin. (Though venomous, its poison won't bring down a human.) Native to South America, the spider makes noise by rubbing the bristles on its legs together; the sound can be heard up to 15 feet away.

3. Heteropoda maxima

A Heteropoda maxima spider
Petra & Wilifried, Flickr // CC BY 2.0

Yet another reason to avoid dark caverns: Discovered in a cave in Laos in 2011, the giant huntsman spider has a leg span of 12 inches. It’s just one of over 1000 species of huntsman spider. These speedy arachnids can chase down their prey with ease and have legs that extend forward, like a crab’s.

4. Golden silk orb-weavers

These arachnids, of the genus Nephila, have a fearsome relative: the largest fossilized spider ever found is an ancestor. Females of this group of spiders, which are found around the world, can have leg spans up to 6 inches (the males are smaller). Though these orb-weavers typically eat large insects, in Australia, some of these spiders have been snapped eating snakes and birds that got caught in their strong, 5-foot-diameter webs.

5. Phoneutria nigriventer

Sure, Phoneutria nigriventer's nearly 6-inch leg span is scary—but there's something else about this spider that makes it even more terrifying: its venom, a neurotoxin that can be fatal to humans. In fact, along with P. fera, this spider is the most toxic on Earth (thankfully, a good antivenom exists). Native to Central and South America, P. nigriventer is also called the Brazilian wandering spider, for its tendency to roam the forest at night, and the banana spider, both because it hides in banana plants during the day and sometimes stows away in shipments of the fruit. When threatened, the spider lifts its front two pairs of legs and sways side to side, as you can see in the video above.

This story originally appeared in 2013.

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