The Capybaras are now in residence (but were way up the back of the enclosure so cannot be seen). The sun was coming in from the left towards the camera, hence the sunspot on the photo at bottom-right.
The logs in the foreground turned out to be for covered shelters, as can be seen on the right-hand one. The fence in the back has been covered in brush (there are male Nyala in the enclosure on the other side of the fence).