You was lucky! The one with the sloths is the much rarer G. moholi. G. senegalensis is with the springhare. You was lucky too for see it - one can pass hours in front of the sloth enclosure without seeing one of these quick shadows that pass many time hidden.
@Kakapo That's great, thanks for the ID! Oddly I saw this species twice, once on the first time through the house when I wasn't quick enough with the camera, then this second time. I never saw the G. senegalensis in with the springhares, but I'd rather have seen this species!