I think something larger like a possum is the most likely option; combined with either the ferrets already on site or a large colony of rats.
Yeah that makes sense having Possums and a colony of Rats considering their (feral) prevalence in New Zealand. Just thought maybe it might make sense to keep a couple of Stoats next to the Ferrera too considering theyre another feral mustelid carnivore feral in New Zealand too and thought visitors might find interesting to see them too.

Hello, does anyone know if Hamilton Zoo plans to bring back animal encounters in the near future?

Visiting the zoo yesterday there was some TV filming taking place at a number of enclosures - including the shared Meerkat/Porcupine one. Looks like there are two new additions with the latest birth of two porcupettes, bringing total number of cape porcupines at HZ to five. Unsure on date of birth and keeper declined to talk to me about it. They are on display and viewable.
Twin Cottontop Tamarins have been born to female Yara and male Mishka. The twins were born on October 11: Log into Facebook | Facebook
The current plan is for the three elderly bulls to pass on before looking at bringing in new giraffes.
During my previous visit, I had a conversation with a member of the keeping staff in the savannah section who informed me about the future plans for giraffes. Apparently, the next stage involves constructing a new giraffe house in the savannah area where the species will be relocated. A natural move in my opinion instead of the wetlands. However, it seemed that this plan is still many years away. It's interesting to know that they plan to wait out the current herd and then introduce new ones. Do we know if they plan to continue holding a bachelor group?