No need to apologise. It's a lovely zoo, great mix of ABC and obscure species in a beautiful location (the hill's hard work though) -I'm sure you'd love it. If you ever get to go there try and contact the staff first (a couple post on here), their hospitality is legendary.
Back to the thread, Tree Kangaroos are great, I'm not sure what their breeding record (especially outside of New Guinea) is though.