Anyway, the actual mythological reference is to Ovid's Fasti. His mom is Gaia and when he was born, he was imprisoned by the river Styx
(uncertain if he was trapped in it or what). Apparently this little guy has one purpose. Anyone who kills the creature and burns the bowels (nice alliteration there, don't you think?) will be given the power to defeat the gods.
Bessie was killed in Ovid's work by Briares, one of the hundred-handed, fifty headed giants. Zeus, pulling a page from Gandalf, sent eagles to pick up the spilt innards before they could be burned.
So what's our lesson here? If you want to defeat the gods AND you have access to an Ophiataurus, then have the fire ready BEFORE killing the thing and disemboweling it. Handy life tip.
Can you believe that nobody has a picture of this swimming cow-snake on the internet? That's why I settled for this one. Yeah, I know this cow here is brown skinned and the real deal is black skinned, but hey, you gotta make sacrifices sometimes.
By the way, Briares uses an adamantine axe to kill it. I think that weird because I've only seen that word used before when referring to the metal that covers Wolverine's skeleton. I really need to check up on my periodic table, I guess.