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the claim

All spiders are venomous.

the verdict
CONTESTED
the evidence cuts both ways
Recorded sources
4 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that all spiders are venomous?

Partly. One reference work states that all spiders possess venom, and a popular spider guide agrees that all spiders are venomous. However, a museum myth-busting page and a biology discussion both note that a small number of spider families (such as Uloboridae) lack venom glands, so the universal claim is disputed.

Verdict: CONTESTED · 4 sources for, 2 against · Last checked

Evidence for · 4
Spider
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Spider. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Spider

Evidence against · 2
Is it true that all spiders are venomous?
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Is it true that all spiders are venomous?. (n.d.). biology.stackexchange.com. https://biology.stackexchange.com/questions/113681

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More for · 3
List of venomous animals
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List of venomous animals. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/List_of_venomous_animals

Dr. Eleanor's Book of Common Spiders
2018
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Buddle, C. M. & Rice, E. S. (2018). Dr. Eleanor's Book of Common Spiders. play.google.com. https://play.google.com/store/books/details?id=oJxVDwAAQBAJ&source=gbs_api

Beware, we are poisonous! : how animals defend themselves
1999
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1936-, D. H. D. (1999). Beware, we are poisonous! : how animals defend themselves. archive.org. https://archive.org/details/bewarewearepoiso0000doss

More against · 1
Myth: Some spiders are poisonous and others are not. | Burke Museum
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Myth: Some spiders are poisonous and others are not. | Burke Museum. (n.d.). burkemuseum.org. https://www.burkemuseum.org/collections-and-research/biology/arachnology-and-entomology/spider-myths/myth-some-spiders-are

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