This room has a couple of sofas you can sit on, which was nice, though they're a bit far back to really sit and there and watch the primates. The map says there's an axolotl area next door but I didn't see it.
Do you remember approximately how many tamarins they have? I seem to remember their old group was aging for a while and there were very few left. By now they may have all passed and acquired new ones.