Are their more signage along the exhibits regarding the species displayed or are all the habitats rotational? This makes perfect sense to photograph the sign if they are indeed rotational and allows for even regular visitors to ID these primates at any point
On this day, I saw the Mongoose Lemurs in the foreground habitat, while specifically the Tamarins and Marmosets were signed to the background exhibit. Their signs are not located by the larger enclosures so I'm guessing they're limited to these two shown in the link. It makes sense since their indoor home is located right behind them.
I also don't see anything other than the Lemurs rotating in the overhead tunnel section, since it is far too small for any of the larger primates - and again, their indoor space is right behind it too.
