Wildbase Recovery is a rehabilitation centre for native NZ birds at the Victoria Esplanade Gardens in Palmerston North (in the lower North Island). Many species can be viewed here during their recovery (before release) and it also houses some permanent residents. It is free to visit.
This is their walk-through aviary, currently housing NZ Pigeon, North Island Kaka, NZ Bellbird, Red-crowned Kakariki, and Tuatara.