^^ I'm not sure that South Korea would be considered a developing country.
Likewise South Africa is also debatable as a "developing" country, but let's assume for the sake of this discussion that it is.
The Johannesburg zoo is fantastic, with a particularly interesting and diverse array of hoofstock, a great gorilla exhibit, fantastic facilities for Lions (including White Lions) and Nile Crocodiles, a brand new Tropical America house, a surprisingly interactive desert North America section with Mountain Lions and overall just a really large and diverse zoo. It is also gorgeous with huge trees and massive gardens. It's also a BARGAIN by western zoo standards.
The Johannesburg Zoo is also home to the only Polar Bears on the continent (although I heard recently from a friend that one of them died, leaving the male alone without a mate). However a newsblast that I received from the city said that they are bringing another Polar Bear to join him. The Polar Bear exhibit is rather typical.
I was particularly fond of the hoofstock because I'm an ungulate nerd, with special attachment to Mountain Zebras, PLains Zebras and Grevy's Zebras all being displayed in seperate but adjacent paddocks and huge, impressive specimens of Water Buffalo.
Also I have been to Two Oceans Aquarium in Cape Town which is truly world class and uShaka Marine World in Durban which is also world class. These are top notch facilities.
Finally I have been to the Zoo in Buenos Aires, Argentina. I loved it because I love zoos, and the grounds are fantastically landscaped. The zoo is quite large and diverse with many specimens and species. That being said, some of the exhibits need to be renovated and it definitely looks shabby and low-budget (which is not surprising considering the state of Argentina's economy). You can feed the animals throughout the zoo pellets though, and even though I was not supposed to, I fed them all by hand (including the zebras lol).
I am worried about the state of Argentine facilities. The media is making a big stink of the saddest Polar bear in the world in Mendoza zoo, and then of course the orca in a really small tank at Mundo Marina. I hope Argentine facilities get a much needed injection of cash and assistance!! It is a beautiful country with fantastic cities, people and wildlife!