It does also send off a very negative message to visitors: "Hey, if a zoo can keep a parrot under such inadequate housing conditions, so can we!" Modern zoos should lead by example.
There is a flight cage for the cockatoos. I didn't post a picture of it because it was already in the gallery, but it's located inside the Australian walk-through. This cage was outside the exit next to the ruffed lemurs. I don't know why this bird wasn't in there.