In Super Mario Galaxy 2, Shiverburn Galaxy, when you look on a certain side of the cliff on the background, you will see 3 figures looking down on mario. These figures are animated, and really creepy. They look like aliens.
Reader Girrrtacos has hacked into the game and got a good amount of info. He said:
"This is what I've found by hacking. It is in the sky model, and it's called "BeyondHellValleySky". The texture for those creepy things (seen in the bottom left) is called "HellValleySkyTree". Maybe they're weird lookin' trees?"
My opinion, these look NOTHING like trees, and you don't see any other "trees" on other cliff. Only those three. They look like aliens to me. I asked my friend GhostFurret on kongregate. Apparently Nintendo didn't mean to put them there. Lies? Who knows really. Although, I wonder if there is some sort of story as to why they are there, or why Nintendo made them in the first place. Why would they put these into a kid-friendly game?