It is true that nobody knows what his species is. I have heard that it isnt allowed for anyone to see the origional Yoda puppet because of his origional feet design giving it away. The feet we see today isn't the origional design. veeeery wierd is what i say.

My favorite sith is no doubt darth Malak, the fact that he doesn't have a jaw is scary but thats what some sith are. My favorite jedi is Plo Koon because i love his race, nothing else. It seems that i have a thing for metal faces...