Neatorama locates this item, which has already gone through a rather extensive round of debunking at the
original site. Original photog Susan Barstow says the larger tracks are rabbit tracks; another poster finds the details on the Great Grey Owl which has a wingspan of 4 1/2 feet.
Maybe the bird has just landed and the prints are its own, but just as likely it has taken a rabbit or some other prey.
In either case, an awesome shot.