Notice the structure in the back left, it's about as large as the bonono exhibits and nearly as tall as the famous Kapok Tree structure. I assume it's also part of the Lemur rotation because we saw the sifakas hanging out at the highest point of the cage from this distance. Unfortunately, it's not accessible to guests, but it is viewable from the path by the giraffes. After looking at the African Forest plans and aerial views on Google Earth, I also was in disbelief to find there is a second gorilla yard next to the main one (same size too). I spent a good deal of time trying to access it on my second visit but a docent later confirmed this was also a private space. The first time I have ever heard of such a thing (a large private exhibit, not private spaces themselves)