Yes - the walkthrough-if-you-happen-to-turn-up-at-just-the-right-time exhibit near the bears.
EDIT: Thought I'd add that we didn't actually go in, this was taken from outside. There was a small group of people waiting by the gate, so I guess it wasn't far off opening for its brief window, but we didn't think it worth waiting (all the lemurs were perfectly visible from outside anyway).