If they got rid of the water, brought that 'extra' space into the Orangs' living area, and netted over the whole area high enough for the animals to see out over the wall, the enclosure would be a lot more suitable.
In the exhibit living 3 bornean orang-utan children, with one old female,the "nurse". The neighbor exhibit is slightly higher, hir living the bornean orang-utan breeding paar and one old female siamang.
