The alien face on left lends it is a spoof. But there is still doubt on where this came from. This is the only photo of bat boy that seems to be partly real. Note same feet as the one above . Note face,ears and feet.
Hair seems strange for college pranks and age of person on right in rear seem little older.
I vote this is real despite all the other photos till orginal source comes to light. This was debunked in 1968 but later written accounts both in newspapers and this past year a discover of a carveing on a mayan temple that shows in detail the same bird plus it is confirmed the carving was from 1000AD which is not that long ago. See other photo below. But the rest of the photo may be real. Science Digest Nov 1968 Posted this photo.