I initially doubted that animal teeth were of sufficient hardness to cut steel. Tooth enamel is formed from apatite or hydroxylapatite to be clearer. Apatite has Mohs hardness of 5, whereas mild steel is around 4.5, copper 3, and cupronickel (kunifer) for more up to date vehicles, is quite a lot harder than 5 but I can't get a figure.
So it seems possible that copper brake pipes and mild steel are potentially vulnerable. Something new every day!
BTW, Mohs is the only measure of hardness which I have a slight knowledge about, but there are many others which could be cited. Enough already!
I think after reading that article I should put you straight on what happened, not that particular article, but what happened to bil and his Toyota.
it`s not the steel or copper pipes they go for, it`s the flexible rubber pipes they chew, (at least I have never seen any metal ones chewed so far) they appear to like the rubber or whatever material they now use for flexible brake pipe.
They do not actually chew right through, they only puncture the rubber and bend the wires around the force of the teeth, at least thats what it looks like, they do sometimes go for flexible rubber/plastic fuel pipes as well not just brake pipes, but I certainly have never seen steel actually cut through by foxes
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