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There would be no special reason (at least that we know of - which is my point) why a very potent venom would give the organism involved any greater survival ability than one that was just sufficient to do the job it needed to do.
An evolutionary advantage of super-venom can be that the predator of the venom-producing species does not have the time to kill the prey after being poisoned in comparison with being poisoned by regular venom
... It is as though there was some sort of isolated venom-based arms race at some point in its prehistory.
Garter snake and Rough-skinned newtCoevolution can occur between predator and prey species as in the case of the Rough-skinned Newt (Taricha granulosa) and the common garter snake (Thamnophis sirtalis). In this case, the newts produce a potent nerve toxin that concentrates in their skin. Garter snakes have evolved resistance to this toxin through a set of genetic mutations, and prey upon the newts. The relationship between these animals has resulted in an evolutionary arms race that has driven toxin levels in the newt to extreme levels
That is interesting AllenG and Chris. Do you think that in the case of Australia that the "arms races" were eventually won leaving some creatures with remarkably powerful sets of toxins but where their enemy (predator or prey) is now extinct?
"why did Amba, my cat have to get bitten by such a tiny thing, like a spider"?