She was indeed Perth's only Pygmy Hippo by all accounts.Good point man.
There was also Penny 0.1 the Pygmy hippo at Perth Zoo from December 1937 (wild born and caught) until she died there in April 1980; based on the old 1975 map of the zoo I think for her last years at the zoo she was the only hippopotamus still there and was the last hippo to date kept at PZ. Don't think she ever had contact with any other member of her species for the 42 years she lived at the zoo. Believe she had one of the longest lifespans of Pygmy hippos thats still considerable in contemporary longevity comparisons.
In regards to their Common Hippos, Perth had a few;
They acquired a male named 'Nat' in 1928 from Africa. He died in 1930 after swallowing a tennis ball - not surprised!
They then acquired 'Pondo' from NZ in 1934. He was born there five years earlier. He was apparently grouped with Penny early on. Not sure how long this lasted but they get along well initially. An article mentioned the pair fighting over food and keepers resorting to switching their diets leading to Pondo getting skinnier and eventually the pair never fought over food again - not sure how much truth is in this story!
Pondo passed in 1955. Presumbly the last Common Hippo at Perth.