|Piccolo Namek/Creative Commons|
"We’re talking timber rattlers, cottonmouths, Russell’s vipers and common Asiatic cobras. We know this because scientists rounded up a bunch of nasties and forced them to bite a bunch of unfortunate opossums, the latter of which responded like it was a mild bee sting. "
Update: In another interesting venom-related story, scientists have found scorpion venom kills MRSA, the notorious drug-resistant strain of Staph, as well as other resistant bacteria. Findings like this are one reason for preserving species: nature has already solved a lot of the chemistry problems we'll soon be facing.
Thanks to Erin for the tip.