The Phoenix Zoo used to have a great sitatunga exhibit with a stream flowing through it. Now it has chacoan peccary I think?
This exhibit now holds rheas, not sure where the Chacoan peccaries have gone.
Reid Park Zoo used to have greater kudu and nyala together. Then for a while we just had the nyala. They were shipped to San Diego Safari Park when we moved the rhino into their yard.
Back in my youth, the Reid Park Zoo had nilgai and blackbuck in what is now the Grevy's zebra yard.
As for San Diego Horn and Hoof Mesa, I always thought it would make more sense for them to focus their antelope collection at the Safari Park and smaller animals at the zoo. Of course, the variety of hoofstock at the Safari Park has gone way down too, so it is really a bummer for people like Ungulate Nerd. I was at the Safari Park two days ago and they do not even have zebras in the field anymore. It is just nothing like what it used to be.
The WAP didn't actually lose too many African species. The only zebra they ever had in field exhibits in recent history were the Hartmann's zebras, and they were precious few.