You’ve probably heard the old tale about daddy long legs being the world’s most dangerous spider — if only their fangs were long enough to bite you. It’s a sticky myth that has clung to these lanky creatures for decades, but the truth is more interesting and far less alarming. We’ll untangle the name confusion between cellar spiders, harvestmen, and crane flies, and walk through what science actually says about their venom, their habits, and whether you should share your bedroom with one.
Pholcidae species count: 2,000+ ·
Body length: Up to 1 cm ·
Adult life span: 223–774 days ·
Animals sharing the name: At least 3: cellar spider, harvestman, crane fly
Quick snapshot
- Cellar spiders (Pholcidae) are true spiders with venom glands and fangs (UC Riverside Entomology)
- Harvestmen are not spiders and lack venom (Missouri Poison Center)
- No confirmed medically significant bite case from a cellar spider (Australian Museum)
- Exact folk origin of the nickname is undocumented
- No household smell proven to repel daddy long legs spiders
- True rate of cellar spider bites in homes is not tracked
- Adult life span: 223–774 days (Australian Museum)
- Web-building cycle: continuous; webs are irregular and often left for weeks (Australian Museum)
- If you find one indoors, catch-and-release is the safe option
- For pest control, reduce insects and seal gaps — no chemical repellent needed
Here is a quick reference on the key specifications for cellar spiders:
| Label | Value |
|---|---|
| Scientific family | Pholcidae |
| Total species | 2,000+ |
| Body length | Up to 1 cm |
| Adult life span | 223–774 days |
| Legs | 8 extremely long, thin legs |
| Human bite risk | No confirmed medically significant case |
Are Australian daddy long legs venomous?
This question sits at the heart of the myth. The answer depends on which animal you mean, because the name covers three very different creatures.
- Cellar spider (Pholcidae): produces venom, but no published medical case shows a medically significant human envenomation (Australian Museum).
- Harvestman (Opiliones): no venom glands, no fangs, completely harmless (Missouri Poison Center).
- Crane fly (Tipulidae): an insect, does not bite or sting.
Are daddy long legs harmless?
For humans, yes — the Australian Museum states there is no evidence daddy-long-legs spiders are dangerously venomous (Australian Museum). The old claim that they are the world’s most venomous spider but cannot bite through human skin is a myth, not a scientific fact. Their venom is relatively mild by spider-venom standards (Chicago Wilderness Magazine).
The myth that daddy long legs are lethally venomous persists because the name is applied to multiple animals. The actual Pholcidae spider poses no known risk to humans, while harvestmen and crane flies have no venom at all.
Are daddy long legs poisonous?
Venom and poison are different. Spiders inject venom; organisms that harm when eaten or touched are poisonous. Since cellar spiders inject venom (not poison), they are venomous but not poisonous. The distinction matters when evaluating risk — there is no evidence that touching or ingesting a cellar spider causes harm. The Britannica notes that their venom is not particularly potent to humans.
Bottom line: For anyone concerned about daddy long legs, the verdict is clear — the true spider (Pholcidae) is venomous but not dangerous to humans, while harvestmen and crane flies have no venom at all. The “most venomous spider” claim is unsupported and treated as a myth by museum, university, and government sources.
Why do they call them daddy long legs?
The name comes from the small body and extremely long, thin legs — a folk name, not a scientific grouping. The Britannica explains that the name is used for pholcid spiders in some contexts and for harvestmen in others. At least three unrelated animals share the name:
- Cellar spiders (Pholcidae) — true spiders with 8 legs and venom glands.
- Harvestmen (Opiliones) — arachnids but not spiders, with one body segment and no venom (UC Riverside Entomology).
- Crane flies (Tipulidae) — insects with 6 legs and 2 wings, harmless as adults.
Is a daddy long legs a spider?
Only if you are talking about the cellar spider (Pholcidae). Harvestmen are not spiders — they have a single body segment, two eyes, and no fangs or venom glands (National Geographic). Crane flies are insects. The name collision creates confusion, and the same capitalized phrase is also used for the 1912 novel Daddy Long Legs, later films, and video-game-related media including Poppy Playtime.
When someone asks “Are daddy long legs spiders?” the answer depends on the context. For safety advice, you need to know which creature you’re dealing with — and most people mean the harmless harvestman, not a spider at all.
The implication: the name collision means that any single answer about “daddy long legs” risks being misleading unless you first specify which animal you mean.
Should I let a daddy long legs live in my room?
Coexistence is a personal choice, but the risks are minimal and the benefits real. Cellar spiders are not aggressive and have no confirmed medically significant bite risk. They eat small insects and even other spiders, including redbacks (Australian Museum). The main drawback is untidy webs in corners, ceilings, and behind furniture.
Is it okay to touch a daddy long leg spider?
Touching one is not known to be dangerous, but unnecessary handling of any spider is best avoided. If you do not want the spider in the room, catch it under a glass and release it outside instead of squashing it. The Britannica notes that cellar spiders can likely pierce human skin with their short fangs, but they are not known to bite humans and are considered harmless.
Letting a daddy long legs spider stay means accepting messy webs in exchange for free pest control. If you prefer a clean room, catch-and-release is a low-risk, low-mess alternative to squashing.
The pattern: the spider offers a genuine benefit — pest reduction — with no confirmed health downside, making coexistence a practical choice.
What attracts daddy long legs?
Daddy long legs spiders are attracted to dark, quiet corners where they can build webs and find small insects to eat. They follow prey into homes and settle in rooms where insects are present — kitchens, basements, and bathrooms are common. The UF/IFAS Blogs emphasizes that prevention works better than repellents: reduce insects, remove webs, and seal gaps around windows and doors.
What smell do daddy long legs hate?
No university or government study has confirmed that a specific smell reliably repels daddy long legs spiders. While anecdotal reports mention peppermint or citrus, the evidence is lacking. The best repellent is eliminating their food source — other insects.
- Reduce indoor insect prey (flies, mosquitoes, moths).
- Seal cracks around windows and doors.
- Remove existing webs regularly to discourage resettlement.
What this means: prevention through habitat management beats any spray or scent when it comes to keeping daddy long legs spiders out of your space.
Why should you never squish a spider?
Most spiders are harmless predators that provide free pest control; squashing them removes that benefit. The Australian Museum notes that daddy long legs spiders even eat other spiders, including redbacks whose venom can be fatal to humans. By killing a spider, you lose an ally against more dangerous species.
What’s the worst spider to be bitten by?
Medically important spiders vary by region. In North America, widow and recluse spiders are the main concerns. In Australia, funnel-web and redback spiders are the primary dangers (Australian Museum). The term “fastest killing” is not a scientific ranking — antivenom makes deaths rare.
What is the fastest killing spider?
The Sydney funnel-web and Brazilian wandering spider are often cited as the most dangerous, but envenomation deaths are extremely rare with modern medical care. Jumping spiders are the animals most often described as the “friendliest” spiders because they are curious, visually oriented, and usually retreat from humans (National Geographic).
What are spiders afraid of?
Spiders are afraid of large animals, sudden movement, and strong vibrations — they flee rather than attack. If you do not want a spider, catch-and-release is a lower-risk, lower-mess solution than squashing it.
Spiders are not your enemy; they are nature’s pest control. Squashing a daddy long legs spider removes a predator that can help keep other, more dangerous spiders like redbacks at bay.
This comparison clarifies the differences between the three animals called daddy long legs:
| Feature | Cellar Spider (Pholcidae) | Harvestman (Opiliones) | Crane Fly (Tipulidae) |
|---|---|---|---|
| Class | Arachnid (true spider) | Arachnid (not spider) | Insect |
| Legs | 8 | 8 | 6 |
| Body segments | 2 | 1 | 3 |
| Venom glands | Yes | No | No |
| Web spinning | Yes (irregular webs) | No | No |
| Human bite risk | No confirmed case | None | None |
| Life span (adult) | 223–774 days | 1 season | A few days |
Upsides
- Free pest control — eats flies, mosquitoes, and other spiders
- Not aggressive and poses no confirmed health risk
- Easy to catch and release if unwanted
- No chemical repellent needed
Downsides
- Untidy webs in corners and ceilings
- May cause minor alarm for spider-phobic individuals
- Webs can collect dust over time
How to safely catch and release a daddy long legs spider
- Get a clear glass or jar and a piece of stiff paper or cardboard.
- Slowly approach the spider; place the glass over it.
- Slide the paper under the rim of the glass, trapping the spider.
- Carry the glass outdoors and gently tip it near a sheltered spot (under a bush or a porch corner).
- Release — the spider will walk out on its own.
Confirmed facts
- The common name “daddy long legs” refers to more than one animal.
- Cellar spiders are true spiders and belong to Pholcidae.
- There is no confirmed medically significant human bite case from a cellar spider.
- The “most venomous spider” claim is treated as a myth by museum, university, and government sources.
What’s unclear
- The exact folk origin of the nickname is undocumented.
- No single household smell has been proven to repel daddy long legs spiders.
- The true rate of cellar spider bites in homes is not tracked by national surveillance.
“The daddy-long-legs spider has venom glands and fangs. However, there is no scientific evidence that they are dangerously venomous to humans.”
— Australian Museum (Australian Museum source)
“The three ‘daddy long legs’ are a cellar spider, a harvestman, and a crane fly. Only one is a spider — and none is dangerous to humans.”
— UF/IFAS Blogs (UF/IFAS Blogs source)
“Adult cellar spiders can live from 223 to 774 days — that’s up to two years of free pest control in your home.”
— Sunshine Coast Council (Sunshine Coast Council source)
The daddy long legs story is a perfect example of how a folk name can create decades of confusion. The animal you are actually dealing with — a cellar spider, a harvestman, or a crane fly — determines the risk profile, and in all three cases the risk to humans is negligible. For the homeowner in Australia or North America, the choice is clear: let the spider stay and reduce other pests, or catch it gently and release it outdoors. Squashing it costs you a harmless predator and solves nothing.
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northernwoodlands.org, bugknow.com, bugknow.com, callnorthwest.com, sunshinecoast.qld.gov.au
Frequently asked questions
Where do daddy long legs spiders usually build webs?
They prefer dark, quiet corners — basements, closets, behind furniture, and ceiling corners where they can catch flying insects.
What do daddy long legs spiders eat?
They eat small insects such as flies, mosquitoes, moths, and even other spiders, including redbacks (Australian Museum).
How long do daddy long legs spiders live?
Adults can live 223 to 774 days — over two years in some cases (Australian Museum).
Why do daddy long legs spiders vibrate or shake in their webs?
This rapid vibration is a defense mechanism to confuse predators and make the spider harder to target (UC Riverside Entomology).
How can I move a daddy long legs spider outside safely?
Use the glass-and-paper method described above in the steps section — never squish it.
Do daddy long legs spiders help control other spiders?
Yes — the Australian Museum notes they can kill and eat redback spiders, whose venom can be fatal to humans, making them a helpful ally.
James Mitchell is Editor-in-Chief at Aussie Insightly, overseeing editorial standards, publication decisions and corrections.