I didn’t know perth had a pygmy hippo let alone a female imported from Africa, did they ever pair her with a male?.Perth could a potential holder, they lack African forest species. They actually used to have a female Pygmy Hippo, Penny, until 1980. She was astonishingly 43 years of age at the time and was imported from Liberia.
Australia could easily also have the space for Common Hippos, and would compliment their current African collection nicely.
If you look at google maps one can see a number of existing dams quite near AZ African exhibit thats been there for a long time. It would be a nice extension to what they have there now but very unlikely to ever happen