Is "Daddy Longlegs are the most venomous spiders but can't bite humans" true?
It's a fact that gets passed around like a party trick: daddy longlegs are supposedly the most venomous spiders alive, saved from being deadly only by fangs too small to break human skin. Specific enough to sound credible, which is exactly the problem. 'Daddy longlegs' actually refers to two unrelated creatures, harvestmen and cellar spiders, and neither one backs up the extreme-venom claim attached to the legend. The fangs-too-small excuse doesn't need to exist, because the venom part was never true to begin with.
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What you were taught
Daddy Longlegs are the most venomous spiders but can't bite humans
What we know now
This is a persistent myth. "Daddy longlegs" can refer to harvestmen or cellar spiders, and neither supports the claim that they are the most venomous spiders on Earth but somehow cannot bite humans. The story is folklore, not settled zoology.
Was "Daddy Longlegs are the most venomous spiders but can't bite humans" taught in school?
Yes — and not as a joke question on a quiz. This science claim showed up in textbooks, worksheets, and classroom posters through the 2010s, which is why so many people still remember it as settled fact long after the science moved on.
Is "Daddy Longlegs are the most venomous spiders but can't bite humans" true?
No. This is a persistent myth. "Daddy longlegs" can refer to harvestmen or cellar spiders, and neither supports the claim that they are the most venomous spiders on Earth but somehow cannot bite humans. The story is folklore, not settled zoology. If you want the primary citation, start with BuzzFeed - 13 Commonly Believed Facts That Are Actually False.
When was this understanding updated?
The evidence had largely shifted by around 2020. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.