And are you saying that Darling Downs has more species that Melbourne now? (Genuine question, I would not know).
Comparing mammals, birds and reptile species they’re about even (109 versus 121), though it should be noted DDZ have acquired several more species (mainly mammals) in the 18 months since this list was compiled and continue to so. They’re therefore steadily steaming ahead.
As of 2020, Darling Downs Zoo had:
35 species of mammal
58 species of birds
16 reptiles
Melbourne Zoo has:
35 species of mammal
38 species of bird
48 species of reptile