This exhibit is actually quite a bit larger than what is shown in the photograph, but I have heard from many Aussies (and myself when I was there in 2007) that it is terribly difficult attempting to spot a tiger with all of the lush plants in the enclosure.
Would be difficult to spot a tiger in the wild too I guess!
It was a new exhibit, so like Ben mentioned, a lot of the plant life was still getting established. Should be good when the plants are a bit more mature.
Can anyone share a picture from this year with the grow of the vegetation. Horticulturally they did a splendid job on the selection of the plants. It feels like Asian rainforest!