I am guessing that the big tree in the middle is available for the monkeys? If so, this is certainly one of the better monkey islands that one has seen. And there are even two of them?
There are two islands that are enormous in size, with zero hotwire and tons of climbing opportunities. One island has a pair of siamangs, and the second island has another gibbon species. So many gibbons have almost the exact same appearance, and curiously enough the sign at the Miami zoo didn't state which species they were.