The cages the orderlies were trapped in and the control room.
The Aviary was an area in the Botanical Gardens where Joker had found the Titan Production Plant and proceeded to keep it guarded from Batman. The Aviary came with two large cages that Joker used to hold two orderlies. The armed henchmen were told to guard the entrance to the plant. The operator for the cages was told by Joker to "send the annoying doctors to hell!" if any collars went off and then made a joke saying, "That's the down one, right?" After Batman was finished in the production plant, Joker killed the orderlies Batman rescued.