Rockhampton Zoo is not listed on ISIS. Judging from the statistics though it is the highest population is captivity at 13 individuals. Correct me, if I am wrong, I think just Melbourne and Taronga in Australia may have bred the species. In the US, just Chicago Brookfield has had a history of breeding southern hairy-nosed wombats with any degree of success. Their latest joey was born in 2008! What is worrying in this species captive population is that in the US 2 males are without any mates (Memphis and Metro Toronto) and in Australia both Steve Irwin's Australia Zoo and Symbio have only females with no access to a male.