Just to add to the thread, I suspect the sighting of the Muntjac near Rossett in 2007 was by my self as I informed the DI at the time. There was also a Fallow killed on the by-pass near Rossett around the same time period, but when i followed the story up, it was an escapee from the outskirts of Llay where it had been kept as a pet...As an aside, I have also seen an otter crossing the slip road in Rossett as well...
I was up on the hills above Chirk castle last year and one of the farmers said that he saw the odd fallow from time to time. Not sure if they are "wild" or escapee's from a herd that are kept in a paddock near Chirk itself..
A few years back I also a few Fallow off the side of the main road near Cilcain, possibly Afonwen. I don't recall exactly the area, but it was much nearer to Mold than I had seen them previously.
I've heard rumours of "deer" (either Fallow or Red) on Minera mountain and the Horseshoe area, but never seen any, plus they are always seen by a "friend of a friend" , but reading this, I guess their is a possiblity. I was also told that there used to be wild goats up over the Horseshoe but again I've never seen them.