Im not sure if this was just added in this update but I was going around seeing what new stuff their is and I came across a wizard riding a raptor. Ill get pics soon, the game just crashed on me.
Hes telling the truth, but I doubt that you can get into it in survival because as soon as u get there you fall right back down and to the normal world. Ill try to get screenshots in a sec.
UPDATE:
Screenshot for proof: http://imgur.com/Nu23M