@Chlidonias Yes that’s correct. The combination surprised me too. The only bird/primate combination I’d previously seen in a NZ zoo was Pygmy marmoset/Blue and gold macaw and Black-handed spider monkey/Cape Barron goose - both at Hamilton Zoo.
@Zoofan15 Wellington kept their Sun Conures and Red-shouldered Macaw with their tamarins too. But Budgies are very small - I'd honestly expect tamarins to kill and eat them.