@Brum This is one of the very few roofed exhibits at the park. I don't think they are pinioned. This exhibit was innitially intended for pheasants I believe so there is barely flying room anyway.
@FunkyGibbon you really weren't kidding about some of the sights here. Those (presumably pinioned) scarlet ibises make me feel exceptionally uncomfortable.
The Siamese crocodile enclosure looked pretty impressive... Until I saw the crowds feeding them in the following photo!