Baloney Inspection Report: Claim #1028 · Inspected Sep 29, 2026, 5:52 PM PDT · Scoring model v2 · Earlier report, model v1
99%“Daddy longlegs are extremely venomous but cannot bite humans.”
99%Zombie Baloney — Refuses To Die
DEAD. BURIED. STILL SHAMBLING AROUND.
Repeatedly debunkedNo credible evidenceRefuses to dieLives on in delusion
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The Verdict
“Daddy longlegs are extremely venomous but cannot bite humans.”99% Zombie Baloney — Refuses To DieVerified blind by 5 frontier AIs · Baloney Inspection Report: baloney.ai/baloney/daddy-longlegs-are-extremely-venomous-but-cannot-bite-humansThe Baloney Sampler
The claim is a long-running myth that mixes together different animals called “daddy longlegs.” The University of California, Riverside, Burke Museum, and Clemson University Cooperative Extension report that harvestmen have no venom glands or fangs, while crane flies have no venom apparatus. They therefore are not extremely venomous.
Cellar spiders are true spiders with venom and fangs, but the University of California, Riverside and Australian Museum report no evidence of unusually potent or medically significant venom. Their small fangs can pierce human skin, and reported bites are mild, so neither part of the claim holds across the animals sharing this name.
Resting on University of California, Riverside Spider Research · Burke Museum · Australian Museum · Clemson University Cooperative Extension
Original Claim Source https://spiders.ucr.edu/daddy-long-legs
Other ways to slice it — phrasings that might have changed the rating
- ““Harvestmen generally cannot meaningfully bite humans and have no venom.”” The reports identify harvestmen as the group with no venom glands or fangs and with mouthparts generally unable to pierce human skin.
- ““Cellar spiders have venom and small fangs, but their venom is not known to be dangerous to humans.”” The reports state that cellar spiders are venomous, can pierce human skin, and cause at most mild reported effects.
- ““Do all animals called ‘daddy longlegs’ have the same venom and ability to bite?”” The reports say the name refers to cellar spiders, harvestmen, and crane flies, which differ in their anatomy and venom apparatus.
Written from the panel’s reports by Perplexity · sonar-pro. Nothing here changed the score.
The Order Ticket
00:52:58CLAIM RECEIVED — QUEUED FOR INSPECTION✓
00:53:34claude-opus-5 REPORTED — SCORE 96, CONFIDENCE 95✓
00:53:44gpt-5.5 REPORTED — SCORE 99, CONFIDENCE 91✓
00:53:21gemini-3.1-pro-preview REPORTED — SCORE 99, CONFIDENCE 100✓
00:53:07sonar-pro REPORTED — SCORE 85, CONFIDENCE 96✓
00:53:50grok-4.6 REPORTED — SCORE 99, CONFIDENCE 92✓
00:54:09PRIMARY MASTER PERPLEXITY — SCORE 99✓
00:53:55BLIND VALIDATION CHATGPT — SCORE 99✓
00:54:19AGREEMENT CONFIRMED — DELTA 0✓
00:54:19SCORING MODEL V2 — MEDIAN OF 5 COUNTED LAB SCORES: 96, 99, 99, 85, 99 → 99. ZOMBIE RULE: THE PRIMARY MASTER FLAGS A LONG DEBUNK HISTORY, THE BLIND MASTER SCORES 99, THE COUNTED MEDIAN IS 99 — PUBLISHED AS 99.✓
00:54:19SOURCE RULE — LABS CITED 26 SOURCES: 0 DISCARDED FOR HAVING NO URL, 4 DISCARDED AS DEAD LINKS (404/410), 4 COULD NOT BE OPENED BY US AND ARE MARKED UNVERIFIED.✓
00:54:19SOURCE RULE — PRIMARY MASTER RULED ON 20 SOURCES: 0 DISCARDED FOR HAVING NO URL, 2 DISCARDED AS DEAD LINKS, 3 MARKED UNVERIFIED, 15 VERIFIED.✓
How This One Was Sliced
Station 1 · Blind Inspection — Five Graders, Zero Peeking
Each lab scored the claim independently, without seeing the others. Open a breakdown for its evidence, its sources, and how sure it was.
Anthropic · EQUAL WEIGHT · 35.6s
claude-opus-5
96%BALONEY
ROUND-1 BREAKDOWN
Evidence offered for the claim- There is a kernel of truth in one half of the claim for one of the three animals called 'daddy longlegs': harvestmen (order Opiliones) have no venom glands and no fangs at all, so they genuinely cannot envenomate or meaningfully bite a person. Crane flies ('daddy longlegs' in the UK) likewise have no venom and mouthparts incapable of biting people.
- Cellar spiders (family Pholcidae), the other animal called 'daddy longlegs', are true spiders and therefore do possess venom glands and chelicerae, so the premise that they carry venom is not invented out of nothing.
- Pholcid fangs are short (roughly 0.25 mm) and their chelicerae are weakly sclerotized compared with, e.g., recluse or widow spiders, which is the likely origin of the 'fangs too short to pierce human skin' half of the legend.
- No confirmed case of medically significant envenomation of a human by a pholcid or a harvestman appears in the toxicology literature — consistent with the 'harmless to humans in practice' end result, though for the opposite reason the legend gives.
Evidence against the claim- The core assertion 'extremely venomous' is unsupported by any toxicological data. No published LD50, venom-potency assay, or clinical report establishes pholcid venom as unusually potent, let alone the most potent of any spider. Arachnologists (Rick Vetter, UC Riverside; Rod Crawford, Burke Museum) state flatly that the claim has never been tested or demonstrated and is a folk legend.
- Harvestmen (Opiliones) are not spiders and have no venom glands whatsoever, so calling them 'extremely venomous' is categorically false, not merely exaggerated.
- Crane flies (the British 'daddy longlegs') have no venom apparatus either and are likewise incapable of biting.
- The 'cannot bite' half is false for cellar spiders: they can and do pierce human skin. The 2004 MythBusters test (Episode 13) filmed a pholcid biting a human arm; the sensation was a barely perceptible short-lived burn, directly contradicting 'extremely venomous but cannot bite'.
- Pholcid fangs are structurally similar to those of the brown recluse, which readily bites humans — so short fang length does not establish inability to penetrate skin.
- Studies of what pholcids actually kill (including other spiders, sometimes larger ones such as redbacks) show their venom is effective on insect/arachnid prey; this says nothing about mammalian toxicity, and the legend conflates the two.
- The claim is a textbook internet/playground legend that has been specifically fact-checked and rejected by Snopes, university arachnology outreach programs, and natural history museums for over two decades.
How sure this lab was95/100 — the lab’s own confidence in the score above, not a second reading of the claim.
SourcesUniversity of California, Riverside — Spider Research (Rick Vetter)edu · 95 · Australian Museumedu · 90 · Encyclopaedia Britannicaother · 80 · Wikipedia (Pholcidae, incl. venom-myth section with citations)other · 65
OpenAI · EQUAL WEIGHT · 45.9s
gpt-5.5
99%BALONEY
ROUND-1 BREAKDOWN
Evidence offered for the claim- The claim has a small kernel of truth only if “daddy longlegs” means harvestmen: common educational sources describe harvestmen as having no fangs and mouthparts too small or weak to pierce human skin, so the “cannot bite humans” part is broadly consistent for that usage.
- The claim also has a separate kernel of truth if “daddy longlegs” means cellar spiders: pholcid/cellar spiders are true spiders and do have venom used on prey. However, that supports only “venomous,” not “extremely venomous” or “cannot bite humans.”
Evidence against the claim- For harvestmen, the “extremely venomous” part is false: harvestmen are not spiders and are described as lacking venom glands, so they are not venomous at all.
- For cellar spiders, the “cannot bite humans” part is false: fact-checking and science-news summaries report that cellar spiders can bite/pierce human skin, but bites are mild and not medically significant.
- The statement conflates different animals called “daddy longlegs” and no cited source supports an animal that is both extremely venomous and unable to bite humans. The commonly circulated version of the claim is a repeatedly debunked myth.
How sure this lab was91/100 — the lab’s own confidence in the score above, not a second reading of the claim.
SourcesSnopesfactcheck · 88 · University of Kentucky Entomologyedu · 87 · Live Sciencenews · 74 · Encyclopaedia Britannicaother · 82
Google · EQUAL WEIGHT · 22.8s
gemini-3.1-pro-preview
99%BALONEY
ROUND-1 BREAKDOWN
Evidence offered for the claim- One of the three animals colloquially known as a 'daddy longlegs' is the cellar spider (family Pholcidae), which, like almost all spiders, does possess venom glands.
- Cellar spiders rarely bite humans because they are not aggressive, which contributes to the anecdotal observation that they 'cannot bite'.
Evidence against the claim- The common name 'daddy longlegs' refers to three completely different creatures: cellar spiders (arachnids), harvestmen (arachnids in the order Opiliones), and crane flies (insects).
- Harvestmen and crane flies possess absolutely no venom glands, making it biologically impossible for them to be 'extremely venomous'.
- While cellar spiders do have venom, toxicological studies have proven that their venom is relatively weak and poses no medical threat to humans, completely debunking the 'extremely venomous' myth.
- Cellar spiders are physically capable of biting humans. Their fangs are approximately 0.25 millimeters long, which is sufficiently long to pierce human skin, though they rarely do so. When provoked to bite, the result is a very mild, short-lived stinging sensation, not a deadly reaction.
How sure this lab was100/100 — the lab’s own confidence in the score above, not a second reading of the claim.
SourcesUniversity of California, Riversideedu · 98 · Burke Museumedu · 95 · Australian Museumedu · 95
Perplexity · EQUAL WEIGHT · 9.1s
sonar-pro
85%BALONEY
ROUND-1 BREAKDOWN
Evidence offered for the claim- The claim is supported only under a narrow, nonstandard interpretation of “daddy longlegs” as cellar spiders (family Pholcidae): these spiders possess venom and fangs, although their venom is not known to cause harmful effects in humans.[https://www.ucr.edu/news/2022/01/14/are-daddy-longlegs-really-most-venomous-spiders-world]
- A cellar spider can likely pierce human skin, and a documented bite was reported to be minor and without lasting effects; therefore, the absolute wording “cannot bite humans” is not supported even for that interpretation.[https://www.abc.net.au/news/2023-09-09/daddy-long-legs-truth-myth-misnomer-spider/102784822]
Evidence against the claim- “Daddy longlegs” commonly refers to harvestmen (order Opiliones), which are not true spiders and lack venom glands and fangs; they therefore are not extremely venomous and cannot inject venom into humans.[https://hgic.clemson.edu/factsheet/daddy-longlegs/]
- The University of California, Riverside’s spider research page states that true daddy longlegs lack venom glands, fangs, and any mechanism for injecting toxins, directly contradicting the claim’s assertion that they are extremely venomous.[https://spiders.ucr.edu/daddy-long-legs]
- The Maryland Department of Natural Resources explains that harvestmen lack venom glands and fangs, while cellar spiders can bite humans but do not possess venom known to significantly harm people.[https://news.maryland.gov/dnr/2024/10/01/fear-busting-creepy-critters-spiders/]
- Colorado State University Extension identifies the claim that daddy longlegs are highly venomous but unable to pierce human skin as an unfounded urban legend.[https://extension.colostate.edu/resource/spiders-in-the-home/]
- Snopes found no evidence that pholcid spiders cause a detrimental reaction in humans, undermining the “extremely venomous” characterization; the source also distinguishes this myth from established evidence.[https://www.snopes.com/fact-check/daddy-longlegs/]
- The statement conflates at least two different animals: harvestmen, which lack venom, and cellar spiders, which have venom and fangs but are not known to be dangerous to humans.[https://www.britannica.com/animal/daddy-longlegs]
How sure this lab was96/100 — the lab’s own confidence in the score above, not a second reading of the claim.
SourcesUniversity of California, Riverside Spider Researchedu · 95 · Maryland Department of Natural Resourcesgov · 95 · Clemson University Cooperative Extensionedu · 93 · Colorado State University Extensionedu · 92 · Snopesfactcheck · 88 · ABC News Australianews · 86 · Encyclopaedia Britannicaother · 88
xAI · EQUAL WEIGHT · 52.4s
grok-4.6
99%BALONEY
ROUND-1 BREAKDOWN
Evidence offered for the claim- The statement is a long-circulating piece of folklore; cellar spiders (Pholcidae), sometimes called daddy longlegs, do possess venom glands as nearly all spiders do.
- Harvestmen (Opiliones), the other animals commonly called daddy longlegs, have very small chelicerae that generally cannot pierce human skin.
Evidence against the claim- Harvestmen (Opiliones) have no venom glands and are not venomous at all.
- Cellar spiders (Pholcidae) produce ordinary spider venom, not exceptionally potent venom; no scientific assay supports calling them extremely venomous.
- Cellar spiders can and occasionally do bite humans; documented effects are mild and localized, so the 'cannot bite humans' clause is false for that group.
- Arachnologists and fact-checkers have classified the full claim as a myth for decades.
How sure this lab was92/100 — the lab’s own confidence in the score above, not a second reading of the claim.
SourcesSnopesfactcheck · 90 · Wikipediaother · 75 · Wikipediaother · 75 · Encyclopedia Britannicaother · 92
Station 2 · The Masters
Primary Master · drawn at random
sonar-pro
99% BALONEY
The statement is false as written and conflates several unrelated animals called “daddy longlegs.” Harvestmen lack venom glands and fangs, while crane flies are insects without venom apparatus. Cellar spiders do have venom and fangs, but no evidence establishes unusually potent venom; their small fangs can pierce human skin and reported effects are mild. The panel therefore treated both major clauses as false in the ordinary broad usage of the name. The score is 99 rather than 100 because the wording contains limited kernels of truth: cellar spiders are venomous, and harvestmen generally cannot meaningfully bite humans. The strongest accepted sources were university, government, museum, and established fact-checking sources. Wikipedia and general-reference sources were retained where they corroborated the higher-quality material, but given lower reliability. No evaluator cited a peer-reviewed toxicology study directly establishing extreme potency, so that portion was rejected rather than merely downgraded.
All five evaluators agreed that the full claim is false, that “daddy longlegs” refers to multiple different animals, that harvestmen lack venom, and that cellar spiders are not known to be dangerously venomous. Four reports explicitly stated that cellar spiders can bite or pierce human skin; the remaining report also treated the absolute “cannot bite” wording as unsupported. The main minor disagreement concerned how strongly to characterize the evidence for cellar-spider biting and venom potency: some reports emphasized the MythBusters demonstration and short-lived sting, while others stressed the absence of medically significant documented reactions. These differences do not affect the verdict.
ZOMBIE FLAG: TRUE — DEBUNK HISTORY ON RECORD
Blind Validation Master · never saw the Primary’s work
gpt-5.5
99% BALONEY
The statement as written is the classic repeatedly debunked daddy-longlegs myth. The reports agree that the name can refer to different animals, but none makes the claim true. Harvestmen and crane flies, commonly called daddy longlegs, lack venom glands, so they are not venomous at all. Cellar spiders do have venom because they are true spiders, but the evidence presented does not support it being extremely potent or medically significant to humans; bites are reported as mild. The 'cannot bite humans' part is also false for cellar spiders, which can pierce human skin. Thus the claim conflates different animals and gets the biology wrong in both directions. Because it is overwhelmingly false and has been specifically debunked for years, it fits the 'Zombie Baloney' category.
AGREEMENT TEST PASSED — BOTH MASTERS SCORED 99% · BLIND VALIDATION CONFIRMED THIS SCORE · NO RE-EVALUATION REQUIRED
How the number was reached · scoring model v2 · how our models work
- Median of 5 counted lab scores: 96, 99, 99, 85, 99 → 99.
- Zombie rule: the Primary Master flags a long debunk history, the Blind Master scores 99, the counted median is 99 — published as 99.
The Evidence
Evidence offered for the claim
- Harvestmen generally cannot bite people DEBUNKED — This is the claim’s narrowest kernel of truth. Harvestmen have no fangs and mouthparts that are generally too small or weak to pierce human skin. However, this applies only to one animal commonly called “daddy longlegs,” and it does not support the claim that they are extremely venomous.
- Cellar spiders possess venom DEBUNKED — Cellar spiders (family Pholcidae) are true spiders and possess venom glands, chelicerae, and short fangs. That supports only the limited proposition that one animal called “daddy longlegs” is venomous; it does not establish exceptional venom potency or inability to bite.
- The animals are usually harmless in practice DEBUNKED — The reports consistently describe cellar-spider bites, when reported, as producing at most a mild, short-lived local sensation, and no medically significant human envenomation was identified. This practical harmlessness is compatible with the subject’s safety, but not with the claim’s explanation.
Evidence against the claim
- The name covers different animals “Daddy longlegs” can refer to cellar spiders, harvestmen, or crane flies. These animals differ substantially in anatomy, so a single statement about their venom and biting ability is misleading.
- Harvestmen have no venom Harvestmen are arachnids but not true spiders; the reports state that they lack venom glands and fangs. Crane flies likewise have no venom apparatus. These animals therefore cannot be extremely venomous.
- Cellar-spider venom is not exceptionally potent The evaluators found no toxicological assay, clinical evidence, or other scientific support for describing cellar-spider venom as unusually powerful or among the most potent spider venoms. Sources instead characterize it as medically insignificant or harmless to humans.
- Cellar spiders can pierce human skin Cellar spiders have short fangs, approximately 0.25 millimeters long, but the reports cite a documented test in which they pierced human skin and caused a brief, mild stinging sensation. Thus “cannot bite humans” is too absolute for this group.
- The full formulation is a persistent myth University, museum, encyclopedia, and fact-checking sources cited by the evaluators have repeatedly identified the combined claim as an unsupported urban legend.
Sources · Reliability · Why Accepted or Discounted
| Source | Type | Reliability | Ruling |
|---|
| University of California, Riverside Spider Research | edu | 98 | ACCEPTED — A university arachnology source directly addresses the myth, distinguishes pholcids from harvestmen, and reports no detrimental human reaction from pholcid bites. |
| Burke Museum | edu | 95 | ACCEPTED — A natural-history museum source is relevant to the taxonomic confusion underlying the myth. |
| Australian Museum | edu | 95 | ACCEPTED — It addresses the small fangs, skin-piercing test, short-lived sting, and lack of harmful human effects. |
| Australian Museum | edu | 90 | ACCEPTED — The same museum source directly supports the key anatomical and clinical points, despite the lower reliability estimate in one report. |
| Australian Museum | edu | 90 | ACCEPTED — It states that cellar spiders have venom glands and fangs but lack evidence of dangerous venom. |
| Encyclopaedia Britannicaunverified | other | 92 | ACCEPTED — It is a reputable reference supporting harvestmen’s biology and lack of venom. |
| Encyclopaedia Britannicaunverified | other | 80 | ACCEPTED — Although one evaluator rated it lower, it remains a relevant established reference for harvestman biology. |
| Encyclopaedia Britannicaunverified | other | 88 | ACCEPTED — It directly summarizes the myth, distinguishes cellar spiders from true daddy longlegs, and describes both as harmless to humans. |
| Snopes | factcheck | 90 | ACCEPTED — It is directly relevant to the claim and documents the fact-checking history, while distinguishing myth from evidence. |
| Snopes | factcheck | 88 | ACCEPTED — The lower-rated duplicate still provides relevant corroboration that the claim lacks support and that human effects are not detrimental. |
| University of Kentucky Entomology | edu | 87 | ACCEPTED — It is an educational source cited for the distinction among animals and the myth’s false framing. |
| Live Science | news | 74 | ACCEPTED — It is a secondary science-news source, useful for corroboration but weighted below university, museum, and government material. |
| Wikipedia | other | 65 | DISCOUNTED — It may summarize cited research but is not a primary or institutional authority; the same points were supported by stronger sources. |
| Wikipedia | other | 75 | DISCOUNTED — It is relevant but secondary and unnecessary for the verdict because institutional and reference sources support the same biology. |
| Colorado State University Extension | edu | 92 | ACCEPTED — A university extension source directly identifies the highly venomous-but-unable-to-bite formulation as an unfounded urban legend. |
| Maryland Department of Natural Resources | gov | 95 | ACCEPTED — A government source supports the distinction between venomless harvestmen and cellar spiders that can bite without significant human harm. |
| Clemson University Cooperative Extension | edu | 93 | ACCEPTED — It directly addresses harvestmen’s lack of venom glands and fangs. |
| ABC News Australia | news | 86 | ACCEPTED — It provides secondary reporting on the distinction among names and the minor nature of a documented cellar-spider bite. |
Every link was opened when this claim was inspected. A dead link was discarded before publication; “unverified” means the site refused our automated check and the link is the one the panel cited. A source without a URL was never kept.
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Serve it the way you want it
The Verdict
“Daddy longlegs are extremely venomous but cannot bite humans.”99% Zombie Baloney — Refuses To DieVerified blind by 5 frontier AIs · Baloney Inspection Report: baloney.ai/baloney/daddy-longlegs-are-extremely-venomous-but-cannot-bite-humans 
