I was discussing the Star Wars movies and I asked the question as to what species Yoda belonged to (eg Chewbacca is a wookie) and no one seemed to know. Does anyone else know?
According to the databank at Starwars.com, his species is unknown.
I also read about Star Wars novelists who wanted to develop a back story for Yoda, exploring his origins and species, but the Great One, George Lucas, forbade it.
Yoda's origins are deliberately vague. Something about keeping him mysterious - although him bouncing around like a rubber ball in Eps 2 and 3 rather knackered that.