Way back when I played SWG, I recall running around the planet Yavin IV and exploring there for the first time. I looked down through the fauna and was surprised to find a small frog casually leaping around on its merry way. I couldn't target it, but I thought it was a great small addition to the game. I think each planet had their own small critters - butterflies come to mind on Corellia (?) - but I liked the little frog I found on Yavin IV.