@Swanson02 I believe you comments are quite correct. The smaller private zoos have to self improve and attract visitors through the gates to operate. The big government funded zoos have an almost endless money stream payed for be the tax paying public. Its hardly an incentive to have a large range of species when a lesser amount will do to display even to the point of the public might consider it not really worth visiting at some point. I believe when we get a big city zoo spending many millions on say a new African rainforest exhibit but only want to include say 2 species in that display its hardly going to be much of an education to the web of life in such a biome display.It's been mentioned before but I'd wager that it is because most of our smaller regional zoos are privately owned. Investing in new exotic animals is what generates more business for them. Compare that to Taronga and Melbourne who will always be bailed out by the government if things go south, thus they have the 'luxury' to downsize their collections.
Obviously, covid has had an effect too, with governments spending less on non-vital services, especially ones involved in tourism like zoos. Also, the AR crowd is probably the largest it has ever been so governments may be wary to invest in improving zoos for fear of "increasing funding to the animal prisons". That's also counterproductive as not improving our zoos and letting our animal populations become geriatric and lonely will just draw more ire from the AR lot.
Saying that I wonder how Sydney Zoo is going. They are private and would have obviously invested a lot into constructing their brand new zoo with hopes of regaining their losses quickly, all for covid to cut out all visitation for 2 years. I would think they would be in the largest debt out of all of the region's zoos.