Its around the back of the building, its only a small yard but they do have one! Its really hard to see from the bridge in the late spring, summer and early fall because of all the leaves!
They also have two large holding areas on either side of the exhibit. It would be nice for them to have an on-display outdoor yard, but the zoo has more pressings needs at the moment (Eurasia, Canadian Domain, The Americas, elephants and orangutans)