Xvarts are funny. I call them "farts"
I also like ankehgs, simply for experience, unique fights, and nice armor. Also, their incredible slow ranged attack is funny to watch; I once had Imoen equip boots of speed and haste herself, get "hit" by an attack, and was able to run to the opposite side of the map with the goo folowing her, then U-turn and get to the other side. Of course, I had to leave the area to avoid being chunked by it