A shadow skitters across the kitchen floor at midnight. You freeze, flip on the light, and catch a glimpse of something with too many legs before it vanishes under the fridge. Whether you're fascinated or ready to move out, that moment captures the strange pull of household pests: repulsion mixed with curiosity.
"Creepy crawlies" is a loose term covering insects (six legs, three body segments), arachnids (eight legs, two body segments), and myriapods (many legs, one long body). Most of them want nothing to do with you. A few cause real problems. Knowing which is which saves you money, stress, and unnecessary pesticide use.
Here are seven common intruders, along with the facts, the myths, and practical steps for keeping them out or managing them when they show up.
Key Takeaway: Most household creepy crawlies are harmless or even beneficial. Identify before you act—killing every bug on sight often does more harm than good.
Spiders have eight legs and two body segments, setting them apart from insects, which have six legs and three body segments. There are over 45,000 known species worldwide, according to the World Spider Catalog, and they live on every continent except Antarctica.
Nearly all spiders produce venom, but it exists to subdue prey, not attack humans. Only a handful of species pose a genuine threat. In the United States, that list is short: the black widow and the brown recluse. Bites from these are rare, and serious reactions are rarer still.
The bigger misconception is that spiders are dangerous. Most species have fangs too small to pierce human skin, and even larger ones would rather flee than bite.
Spiders earn their keep. A single house spider can eat hundreds of insects in a year, including mosquitoes, flies, and cockroaches. In gardens, they control aphids and other plant pests without any chemical input.
Prevention and control: - Leave cobweb spiders alone in corners and basements—they're doing free pest control. - Clear clutter, cardboard, and woodpiles near the house to reduce hiding spots. - Seal cracks around windows, doors, and foundations. - Shake out shoes, gloves, and stored clothing before wearing them. - If you find a black widow or brown recluse, don't handle it. Call a professional.
Key Takeaway: A spider in your house is usually a roommate, not a threat. Relocate it or leave it be—unless you can positively identify it as a dangerous species.
Cockroaches have been around for roughly 300 million years, and they've picked up a few survival tricks. They can live for up to a week without their heads, according to University of Illinois Extension, because they breathe through spiracles (small openings along their bodies) and have an open circulatory system that doesn't depend on blood pressure from the brain.
That said, the popular claim that cockroaches would survive a nuclear apocalypse is overstated. They're more resistant to radiation than humans, but not invincible.
The real concern with cockroaches is health. Their shed skins, saliva, and droppings contain allergens that trigger asthma and allergies, especially in children. They also carry bacteria on their bodies, including salmonella and E. coli, and can contaminate food and surfaces.
Prevention: - Keep counters, floors, and drains clean. Cockroaches eat crumbs, grease, and even paper. - Store food in sealed containers. Don't leave pet food out overnight. - Fix leaky pipes and eliminate standing water. - Seal cracks around cabinets, baseboards, and pipes. - Take out the trash regularly and keep bins closed.
Control: - Gel baits and bait stations work better than sprays because cockroaches carry the bait back to their harborage. - If you see roaches during the day, the infestation is likely severe. Call a professional.
Key Takeaway: Cockroaches aren't invincible, but they are persistent. Sanitation and sealing entry points do more than any single spray.
Bed bugs are small, reddish-brown insects that feed exclusively on blood, preferably human. They're not known to transmit diseases, which is the most common misconception about them. The real damage is psychological and financial: bites itch, infestations spread, and treatment is expensive.
These insects are built for survival. According to the CDC, bed bugs can survive two to five months without feeding, and up to a year in cooler conditions. That's why moving out of an infested apartment for a few weeks rarely solves the problem.
Signs of infestation: - Itchy bites in lines or clusters, often on arms, neck, or face - Dark fecal spots on sheets, mattresses, or furniture - Shed skins and tiny white eggs in seams and crevices - A musty, sweet odor in heavy infestations
Prevention: - Inspect second-hand furniture before bringing it inside. - Use mattress and box spring encasements. - When traveling, check hotel room seams and headboards. Keep luggage off the floor and away from the bed. - Wash and dry clothing on high heat after returning from a trip.
Control: - Diatomaceous earth can help as a supplement, but it won't eliminate an infestation alone. - Professional heat treatment or chemical treatment is usually necessary. Bed bugs hide in places sprays can't reach.
Key Takeaway: Bed bugs don't spread disease, but they spread fast. Early detection and professional treatment are the only reliable solutions.
Termites are detritivores—they eat dead wood and plant material. In nature, this is essential. They recycle nutrients and keep forests from choking on fallen trees. In your house, the same behavior is catastrophic.
The National Pest Management Association estimates termites cause about $5 billion in property damage in the United States each year. Most homeowner insurance policies don't cover it.
The misconception here isn't about termites themselves—it's about the blanket idea that all insects are pests. Termites are beneficial in ecosystems. The problem is when they mistake your foundation for a dead tree.
Prevention: - Control moisture around the foundation. Termites need water. - Keep wood mulch, firewood, and lumber away from the house. - Fix leaks and ensure proper drainage. - Schedule annual professional inspections, especially in high-risk regions.
Control: - Bait systems and liquid barriers are the two main professional approaches. - DIY treatments rarely reach the colony. Termites nest underground or inside walls. - If you find mud tubes, discarded wings, or hollow-sounding wood, call an inspector immediately.
Key Takeaway: Termites are nature's recyclers—until they recycle your house. Moisture control and annual inspections are your best defense.
Ants live in colonies with a queen, workers, and males. Some species can lift 50 times their body weight, which is impressive for a creature the size of a sesame seed. They're also one of the most common household pests in the world.
Two species cause most indoor problems:
Not all ants are pests. Some prey on other insects, aerate soil, and disperse seeds. But when they invade your kitchen, the distinction stops mattering.
Prevention: - Seal cracks around windows, doors, and foundations. - Keep food in sealed containers. Wipe up crumbs and spills immediately. - Rinse recyclables before putting them in bins. - Trim tree branches away from the house. Carpenter ants use them as bridges.
Control: - Bait stations work because ants carry the poison back to the colony. - Sprays kill visible ants but often split colonies, making the problem worse. - For carpenter ants, find and treat the nest. This usually requires a professional.
Key Takeaway: Ant baits beat sprays. You want the colony dead, not just the ants you can see.
Ticks are arachnids, not insects—a distinction worth knowing because it affects how you approach prevention and removal. They feed on blood and can transmit Lyme disease, Rocky Mountain spotted fever, and other illnesses.
The CDC estimates about 30,000 people in the U.S. develop Lyme disease each year, though the actual number is likely higher due to underreporting.
Prevention: - Avoid tall grass and brushy areas, especially in spring and summer. - Use EPA-approved repellent on skin and clothing. - Wear light-colored clothing so ticks are easier to spot. - Check yourself, your children, and your pets after time outdoors. Pay attention to armpits, hair, waistbands, and behind the knees.
Removal: - Use fine-tipped tweezers. Grasp the tick as close to the skin as possible. - Pull straight up with steady pressure. Don't twist or jerk. - Clean the bite area with alcohol or soap and water. - Save the tick in a sealed bag or jar in case symptoms develop. - Watch for fever, rash, or joint pain in the following weeks. See a doctor if anything appears.
Control: - Keep grass mowed and clear leaf litter. - Create a gravel or wood chip barrier between lawn and wooded areas. - Treat pets with vet-recommended tick prevention.
Key Takeaway: Remove ticks promptly and correctly. The longer a tick feeds, the higher the risk of disease transmission.
These two are often confused, but they're different animals with different habits.
Millipedes aren't poisonous, but many species secrete an irritant fluid when threatened. It can stain skin and cause mild irritation, especially if you rub your eyes afterward. Centipedes can bite, and some larger species deliver a painful sting, though it's rarely dangerous to humans.
Centipedes are actually beneficial. They hunt cockroaches, silverfish, and other household pests. If you see one, it's usually because there's something else for it to eat.
Prevention: - Reduce moisture. Both prefer damp environments. - Fix leaks and improve ventilation in basements and crawl spaces. - Remove clutter, leaf litter, and mulch near the foundation. - Seal cracks and gaps around doors and windows.
Control: - Usually unnecessary. If you eliminate moisture and food sources, they'll move on. - Diatomaceous earth can help in severe cases. - If you're finding them regularly, address the underlying moisture problem first.
Key Takeaway: Centipedes are predators, not pests. If you see them, you probably have a bigger bug problem they're helping to solve.
The creatures on this list range from genuinely dangerous (termites, ticks) to mostly harmless (spiders, centipedes). The difference matters.
Integrated pest management (IPM) is the framework professionals use: identify the pest, monitor activity, prevent entry, and treat only when necessary. It's cheaper, safer, and more effective than spraying everything in sight.
These animals play real roles in ecosystems. Spiders and centipedes control other pests. Termites recycle dead wood. Even cockroaches break down organic matter in nature. The problem isn't their existence—it's when they cross into our space.
Stay informed. Learn to identify what you're dealing with. Act when it matters, and leave the rest alone.
Key Takeaway: The best pest control is prevention, identification, and knowing when to call a professional.
Are spiders insects? No. Spiders are arachnids. They have eight legs and two body segments, while insects have six legs and three body segments.
Do earwigs crawl into human ears? No. This is a myth. Earwigs are harmless to humans and don't lay eggs in ears.
Can cockroaches survive a nuclear explosion? They're more radiation-resistant than humans, but not invincible. The claim is exaggerated.
How can I prevent bed bugs? Inspect second-hand furniture, use mattress encasements, and check hotel rooms when traveling. Keep luggage off the floor.
What should I do if I find a tick on me? Remove it with fine-tipped tweezers, pulling straight up. Save the tick and watch for symptoms like fever or rash.
Are centipedes dangerous? Most are harmless. Larger species can bite, but the sting is rarely serious for humans.
How do I get rid of ants in my house? Use bait stations, seal entry points, and keep food sealed. For carpenter ants, call a professional.
Do all spiders spin webs? No. Some hunt actively and don't build webs at all.
What attracts silverfish? Silverfish feed on starches—paper, glue, clothing—and thrive in humid environments.
Are millipedes poisonous? No, but many secrete an irritant fluid that can cause mild skin irritation.
If you're dealing with a persistent pest problem, don't hesitate to contact a professional pest control service. For more tips on identifying and managing creepy crawlies, subscribe to our newsletter and download our free pest prevention checklist.