Taronga's annual (zoo-friends) pass gives access only to Sydney Taronga and the Western Plains zoo in Dubbo, owned by Taronga as well.

If you ever get the chance, you should check out Canberra zoo. We were there a few months ago, and I have to say, I really loved Canberra zoo. Not as crowded and huge enclosures for the animals. Plus there's also a small aquarium in the zoo too!