516w
Since there isn't much showcase for these, here is an Elite Mutant Ribbon Pig. I managed to get several to spawn every 100-250 normal ones I killed. I'm level 180 and they are 168, which is within my level range, and I've heard Elite Monsters won't spawn for people outside the map's level range, so keep that in mind. (Put under Boss since this counts as above normal mobs, even if not an Elite Boss.)