Was the McNeil Avian Center (1916 Bird House) open when you went? I saw on the zoo's map its shown as closed with the other indoor attractions, but thought maybe with Covid calming down it might be opened up again by now.
@Sarus Crane I think it was closed but I really don't know. I have eosinophilic pneumonia which means I cant go into enclosed spaces with birds. So the Avian center could be open but I did not check.