This is an example of the high standard of enclosure at Taiping Zoo. Most of the time in Asia (and elsewhere) macaques get horrible cages. Here at Taiping they get a huge cage. There's not as much climbing structure as I would like, but Stump-tailed Macaques are largely terrestrial anyway.
The cage is supposed to be a shared exhibit with Small-clawed Otters (Amblonyx cinereus) but these were not present on my visit, although the sign for them was there. It isn't really a mix I would make - I don't trust macaques!