Why Do Daddy Long Legs Like My House?
The appearance of daddy long legs, also known scientifically as cellar spiders or pholcids, in your home is a common occurrence. These spindly-legged arachnids are often found in quiet, undisturbed corners, and their presence can spark curiosity and sometimes concern. But why do they seem to favor our houses? The answer lies in a combination of factors that make our homes an ideal habitat for them.
Understanding the "Daddy Long Legs"
First, it's important to clarify what we generally refer to as "daddy long legs." While the term is colloquially used for a few different creatures, in the context of houses, it most commonly refers to the **Pholcidae family**, known for their exceptionally long, thin legs and small bodies. These are true spiders, though they have some unique characteristics. There's also the harvestman (order Opiliones), which has a fused body and is not a true spider, and the crane fly (family Tipulidae), an insect with long legs. For the purpose of this article, we'll focus on the cellar spider, the most frequent house guest.
Key Factors Attracting Cellar Spiders to Your Home
Several elements within a typical American house make it an attractive dwelling for daddy long legs:
- Shelter and Protection: Our homes offer excellent protection from the elements and predators. Unlike the outdoors, where they might be exposed to harsh weather, birds, or larger insects, the indoors provides a stable and safe environment. They can hide in dark, undisturbed areas like basements, attics, garages, and behind furniture, where they are less likely to be bothered.
- Consistent Temperature and Humidity: Cellar spiders thrive in environments with relatively consistent temperatures and moderate humidity. Many homes, especially those with basements or crawl spaces, maintain these conditions year-round. Extreme temperature fluctuations or overly dry air can be detrimental to their survival.
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Abundant Food Sources: Perhaps the most significant reason daddy long legs are drawn to houses is the availability of food. These spiders are predatory, and they primarily feed on other invertebrates. Your home likely harbors a variety of insects and other arthropods that serve as their prey. This includes:
- Mosquitoes
- Flies
- Moths
- Crickets
- Other spiders (including some that might be considered pests themselves)
- Silverfish and other small household pests
- Dark, Quiet, and Undisturbed Areas: Cellar spiders are nocturnal or crepuscular, meaning they are most active at dawn and dusk or at night. They prefer to rest in dark, quiet spots during the day. Areas like corners of rooms, ceilings, behind wall hangings, in closets, or within basements provide the perfect undisturbed environment for them to build their irregular, cobweb-like webs and ambush their prey.
- Building Their Webs: Their unique webs are not the sticky, orb-like structures of some other spiders. Instead, cellar spiders create loose, tangled webs. These webs are highly effective at catching small, flying insects and are best constructed in locations where they won't be frequently disturbed by human activity. Your less-trafficked areas offer these ideal conditions.
Are They Harmful?
One of the most common questions people have is whether daddy long legs are dangerous. The good news is that **cellar spiders are completely harmless to humans and pets.** They do not possess venom that is potent enough to cause any significant harm. In fact, their venom is so weak that it's practically negligible to us. While they can bite if provoked, it's extremely rare, and the bite would feel like a tiny pinprick at most, without any lasting effects.
"Cellar spiders are beneficial inhabitants of your home. They are highly effective at controlling populations of other insects that may be considered more bothersome."
Living with Daddy Long Legs
Instead of trying to eradicate them, many people find it beneficial to coexist with daddy long legs. They are essentially natural pest control. By preying on mosquitoes and flies, they help keep the insect population in your home in check. Their presence is often an indicator that your home may have a slight insect problem.
If you do find their webs unsightly, the easiest way to manage them is through regular, gentle cleaning. A quick sweep of corners and ceilings can remove their webs. However, if you leave them be, they will continue their quiet work of keeping other pests at bay.
Frequently Asked Questions (FAQ)
How do daddy long legs get into my house?
Daddy long legs can enter your house through small openings such as cracks in walls, gaps around windows and doors, or even through vents and utility lines. They are also attracted to the warmth and shelter your home provides, making them likely to seek entry when outdoor conditions are less favorable.
Why do they spin their webs in corners?
Corners of rooms, ceilings, and other undisturbed areas are ideal for daddy long legs because these locations offer protection from drafts and disturbances. These sheltered spots allow them to build their irregular, tangled webs effectively and wait patiently for prey to become ensnared.
Are daddy long legs dangerous to my pets?
No, daddy long legs are not dangerous to pets. They are harmless to humans and animals, and their venom is not potent enough to cause any adverse reactions.
Why are there so many daddy long legs in my basement?
Basements often provide the ideal conditions that daddy long legs seek: darkness, relative quiet, consistent temperatures, and moderate humidity. Additionally, basements can sometimes harbor more insects and other small invertebrates, providing a rich food source for these spiders.
Can I get rid of daddy long legs permanently?
While it's difficult to permanently rid your home of daddy long legs, you can manage their numbers by regularly cleaning away their webs and sealing any entry points. However, many people choose to let them stay, as they are beneficial in controlling other household pests.
