In my Greek Mythology setting AD&D campaign, the first monster the characters met was this, a bright orange hided two-headed crazed bull, charging madly through the forest. It was sent by the gods to test the strength, courange and skills of the young Heroes, Achillios and Antiope. They passed the test and defeated the bull! (And shot up a level in the process! Hooray!)
Very good depiction of wild strange fierceness.
It says something about the company I've been keeping lately that, when this showed up as your latest in my notifs, my first thought was not of Greek mythology, but of the Brahmins from the Fallout series. (I don't even play them; I know about Brahmins via sheer cultural osmosis.)
Ahhh, well after a brief google search, I can totally see why that would be your first inclination. The Arcadian Two-Headed Bull is not lifted from any real Greek stories, but something I made up that was Greek mythology-like (I was thinking along the lines of the Calydonian Boar). I had no idea that two-headed cattle was a Fallout thing.