ralphchadkirk
Established Member
??? I'm not sure I follow your question. All spiders are poisonous (venomous), but don't all have fangs long/strong enough to penetrate human skin and even if they do, the venom they inject isn't powerful enough to do much more than a mild itch to something approaching a nettle sting. Of course some species in some other parts of the world can do much more damage.
Generally poisonous means you cannot eat it, whilst venomous means they carry some sort of toxin to hurt you. At least, that's the case for snakes - some are neither, some are both, and some are one but not the other.