The worldwide estimate of described spider species exceeds 46,000. Out of that number, only about 200 species are known to be of medical concern to humans. In North America alone, there are more than 3,800 spider species—but before you panic, most of them live outdoors, away from people and homes.
Experts say that only about 30 spider species are synanthropic, meaning they live in close association with humans. Now, that’s a relief for anyone worried about sharing space with these arachnids!
You might be wondering: with so many spiders around, are they actually a threat to my family and me?
In North America, only two groups—widow spiders and recluse spiders—are considered medically significant. While nearly all spiders have venom, most bites cause little or no harm. Interestingly, spiders can control the amount of venom they inject, so even when bites occur, many are mild or completely harmless.
There are four native widow spider species found in North America:
The Brown Widow is an introduced species.
A key identification feature of widow spiders is the red or reddish hourglass marking on the underside of the abdomen. Additionally, Brown Widow egg sacs have soft spikes or orbs on the surface, unlike the smooth sacs of native widows.
Recluse spiders can be identified by:
Spiders love hiding in undisturbed areas. Keep boxes, paper, and clothing organized and limit clutter in basements, garages, and closets.
Remove debris, firewood, stones, and bricks from near your home. Keep grass trimmed and shrubs pruned so they don’t touch your walls or windows.
Inspect your home’s doors, windows, and foundation cracks. Sealing these prevents spiders—and the insects they feed on—from entering.
If you’re dealing with frequent spider sightings, contact a professional pest control service. Wise House Pest Control uses eco-friendly, pet-safe treatments that eliminate spiders while keeping your home and family safe.
