As a hunter, what is the largest beast you have fell?

There are so many very large beasts that roam Pandora.  The largest I have fallen so far would have to be a Rakk Hive.  Those fellows are really difficult to take down, so long as you know that its weak point is it’s eyes.  If your weapon is powerful enough, it will go down with one shot.

I have yet to fell a Drifter, however.  Very admirable how the original Vault Hunters were able to defeat the legendary Skyscraper.  I would have loved to have that bloke as a trophy.