I did not realise that some of the hippos in Australia were actually inbred through father and daughter mating.
Yes at Auckland Zoo, Kabete bred with Nada to produce Snorkel; and Bonnie to produce Faith. Kabete then sired several offspring to Snorkle and Faith. Two of those offspring (Fonzie and Solucky) then bred with each other to produce Cuddles, who is the mother of Kibibi and Kendi.
Harold at Werribee similarly sired two daughters in 1990 named Primrose and Brindabella. He then bred with each of them in turn to produce Tulip, Lotus and Pansy.