> The reason being that for most snakes, the fangs and venom delivery are separate.
> The fangs are intended the break the skin, while the venom is sprayed on from a
> gland elsewhere in the mouth. So while the fangs may still go through and puncture
> the skin, any lightweight material will serve to intercept the venom spray."
Nice theory, but totally false. Dangerously false.
It ignores two categories of potentially fatal snakes: those with hypodermic fangs for direct injection, and those with channel fangs. Gaiters will normally block most of the venom from channel fangs, but you need to remove the wet fabric carefully. It sticks in my mind that the ones with hypo fangs are usually smaller, and may be physically blocked by a cotton or Cordura canvas gaiter, but I would need to check that one a bit more.
What are called 'spitting cobras' actually eject the venom from their fangs. The exit holes point forwards. The idea that they blow or spit the venom is an old one, but it's wrong. Think waterpistol for the mechanism. A few vipers also can do this.
I was going to say that lizards can be considered 'venomous' because of toxic bacteria on their teeth (go Colgate!), but I find that is wrong. Some lizards are genuinely venomous. The little bearded dragon lizards found around Australia, even in towns, carry a sort of rattlesnake venom. Monitor lizards and iguanas have toxic venoms. The gila monster and beaded lizard of America carry venom. And I have my suspicions about certain politicians too.
Cheers