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National Geographic says the following about the Australian funnel-web spider:

The fangs of a funnel-web spider are very strong—they can pierce through shoe leather and fingernails.

I'm not skeptical about the shoe leather since leather is not a hard material. But fingernails are hard so I am skeptical of that part of the claim.

pacoverflow
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    https://media.australianmuseum.net.au/media/dd/images/Spider.width-1600.735bca1.jpg – Daniel R Hicks Apr 13 '20 at 18:17
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    Do you really think fingernails are tougher than leather? My impression is the opposite. Fingernails are not as pliable, but they are thin, brittle, and permeable. I look forward to more authoritative answers to your question than my own speculation. – PoloHoleSet Apr 13 '20 at 20:15
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    @PoloHoleSet: also, (human) fingernails have a relatively narrow thickness range, although in some cases, e.g. toe injury, you can get pretty thick (and semi-detached) ones... "Shoe leather" can have various thicknesses as well, esp. on less fancy boots, belts etc. – Fizz Apr 14 '20 at 03:47
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    Near miss: [This author collected spiderbite cases](https://www.sciencedirect.com/science/article/pii/S0041010102003951) and reported a *different* (larger) Australian spider species had bitten through a fingernail. – Oddthinking Apr 14 '20 at 04:45

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