I missed out on it last time, got confused when we left the gorillas and were told "nothing" was down the other way and didn't know about the small aviary at the time. On my list of things I missed and need to go back for!
@TinoPup It is indeed one of the most overlooked spots at the zoo -somehow reminds me of the row of avairies near the polar bears in San Diego, both with an amazing selection of species but largely ignored by visitors.