I missed them completely, despite visiting a few times around the time they were there. I always wondered if they were actually there or if they were planned but never arrived - clearly they were real!
That is really strange then as I didnt see them either, but they were there as the proof is in the picture! Maybe they were only on show for a short while and were an old couple who passed on.
I only remember reindeer, zebra, and bison in this area (and I really miss the last two).
I also do not recall addax at Dudley, I do remember Arabian oryx (which these are clearly not) but definitely not these. I remember the zebra being here and possibly a camel species(?) along with bison. 100% sure that I don't remember these which is a shame as they are one of my personal favourites when it comes to hoofstock.