The question “Are daddy long legs spiders?” has confused homeowners for generations, leading to widespread misconceptions about these common household creatures. The confusion stems from the fact that multiple different animals share the same common name, creating identification challenges and perpetuating myths about their classification and danger levels.
Understanding what daddy long legs actually are, their relationship to true spiders, and their characteristics helps dispel common fears and provides accurate information for proper identification and management around your home.
What are daddy long legs?
The term “daddy long legs” actually refers to three completely different types of arachnids, which explains much of the confusion surrounding their classification. The most commonly encountered indoor “daddy long legs” are cellar spiders (Pholcidae family), which are true spiders with eight legs, two body segments, and the ability to produce silk webs. These are the creatures most homeowners find in basements, corners, and other undisturbed areas of homes.
The second type are harvestmen (Opiliones order), which are arachnids but not spiders, having a single body segment rather than the two segments that define spiders. The third type are crane flies (Tipulidae family), which aren’t arachnids at all but rather flying insects that resemble large mosquitoes with extremely long legs.
This naming confusion has led to widespread misinformation about their characteristics, behavior, and danger levels. When most people encounter “daddy long legs” indoors, they’re typically seeing cellar spiders, while outdoor encounters often involve harvestmen.
Are daddy long legs spiders?
The answer depends entirely on which creature you’re referring to when you say “daddy long legs.” Cellar spiders (the indoor variety) are absolutely true spiders, belonging to the spider order Araneae. They possess all the defining characteristics of spiders: eight legs, two distinct body segments (cephalothorax and abdomen), fangs, venom glands, and silk-producing spinnerets. They build irregular webs in corners and undisturbed areas and feed on other small insects.
Harvestmen, however, are not spiders despite being arachnids. They belong to the order Opiliones and have several key differences from true spiders: they have a single, undivided body segment, cannot produce silk, lack venom glands and fangs, and feed differently than spiders. While they’re related to spiders as fellow arachnids, they represent a completely separate evolutionary lineage.
Crane flies aren’t spiders at all—they’re insects with six legs (not eight), wings, and completely different anatomy. The confusion arises because all three creatures share extremely long, thin legs and the same common name. So when someone asks if daddy long legs are spiders, the scientifically accurate answer is: “It depends on which animal you’re actually looking at.”
Are daddy long legs poisonous?
None of the creatures commonly called “daddy long legs” are poisonous or pose significant danger to humans. The widespread myth that daddy long legs are “the most venomous spiders but can’t bite humans” is completely false and appears to be a persistent urban legend without scientific basis.
Cellar spiders do have venom glands and can bite, but their venom is designed for subduing small insects and poses no threat to humans. Their fangs are capable of penetrating human skin, but bites are extremely rare and result in nothing more than minor, temporary irritation similar to a mosquito bite. There are no documented cases of cellar spider bites causing serious medical problems.
Harvestmen cannot bite at all since they lack fangs and venom glands entirely. They’re completely harmless scavengers that feed on dead organic matter and small insects. Crane flies also cannot bite humans and are harmless flying insects that don’t even feed on blood.
The confusion about toxicity likely stems from misidentification and the mixing of different creatures under the same common name. None of these animals should be considered dangerous, and the persistent myths about their lethality are scientifically unfounded and should be disregarded.
How to prevent a daddy long leg infestation
Preventing daddy long legs (primarily cellar spiders) involves reducing their preferred conditions and food sources:
- Reduce moisture: Use dehumidifiers in basements and crawl spaces, fix leaky pipes, and improve ventilation in humid areas where cellar spiders thrive.
- Eliminate food sources: Control other insects that serve as prey for daddy long legs through regular cleaning and pest management.
- Remove hiding places: Declutter basements, storage areas, and corners where these arachnids build webs and establish territories.
- Seal entry points: Caulk cracks in foundations, around windows, and other openings where daddy long legs might enter from outdoors.
- Regular cleaning: Vacuum corners, remove existing webs, and maintain clean, organized spaces that are less attractive to these web-building spiders.
What to do if you have a daddy long leg infestation
Managing daddy long legs focuses on removal and habitat modification rather than chemical treatments:
- Physical removal: Vacuum existing spiders and their webs regularly, focusing on corners, basements, and undisturbed areas where they congregate.
- Web destruction: Remove webs completely using a broom or vacuum, as this forces spiders to relocate and discourages reestablishment.
- Moisture control: Address underlying humidity problems that make areas attractive to both daddy long legs and their insect prey.
- Professional assessment: Contact pest control services for severe infestations or if underlying pest problems are attracting large numbers of predatory spiders.
- Ongoing maintenance: Establish regular cleaning routines and continue habitat modification to prevent reestablishment of spider populations in treated areas.
When to call a professional
When dealing with daddy long legs problems that are affecting your home’s comfort or creating concerns about spider populations, professional pest control services offer the most effective and comprehensive solutions. At Aptive, our pest control experts can assess the extent of your arachnid activity and correctly identify whether you’re dealing with cellar spiders, harvestmen, or other species, to best determine the most appropriate treatment methods for spider control and addressing any underlying pest issues that might be attracting them.
If you’ve noticed increased daddy long legs activity around your property or have concerns about spider populations in your home, don’t wait—contact Aptive today for a free quote. We’ll help you eliminate the problem while keeping your home comfortable and addressing any underlying conditions that contribute to arachnid infestations.
FAQs about daddy long legs
Here are some frequently-asked questions from homeowners about daddy long legs and preventing an infestation.
Q: Do daddy long legs eat each other?
Cellar spiders (true spiders called daddy long legs) can exhibit cannibalistic behavior, particularly when food sources are scarce or when smaller spiders venture into larger spiders’ webs. This is common among many spider species and isn’t unusual behavior. However, harvestmen (also called daddy long legs) are scavengers that feed on dead organic matter and small insects, not each other. Cannibalism among cellar spiders typically occurs during territorial disputes or when prey is limited, making it an opportunistic survival behavior.
Q: Do daddy long legs bite people?
Cellar spiders (the true spiders) can technically bite humans but rarely do so, and their bites are harmless, causing only minor, temporary irritation similar to mosquito bites. Their fangs can penetrate human skin, but they’re non-aggressive and prefer to flee rather than bite. Harvestmen cannot bite at all since they lack fangs and venom glands entirely. Crane flies (also called daddy long legs) are insects that cannot bite humans. Most encounters with any of these creatures result in no biting incidents whatsoever.
Q: Where are you most likely to find daddy long legs?
Cellar spiders are most commonly found in dark, undisturbed indoor areas like basements, crawl spaces, corners of rooms, garages, and storage areas where they build irregular webs. Harvestmen prefer outdoor environments under rocks, logs, leaf litter, and garden areas, though they may occasionally wander indoors. Crane flies are typically found near outdoor lights at night or flying around vegetation. All three prefer areas with adequate moisture and minimal human activity, making them common in neglected or infrequently cleaned spaces around homes.
