Auk

Kangaroos are the clear winner in my experience, but we’ve also got possums and various parrots (e.g. sulphur crested cockatoos). Wombats too but they’re less common to see.

Canberra actually - it’s an old dairy building that’s part of Duntroon (one of the original homesteads of the region but more well known for being where RMC/ADFA is). It pre dates Canberra by a good bit though since development of the city only really began to gain traction in the 1920s.

The oldest still existing building is circa 1832, so ~192 years old - not much compared to some places but doing well for an Australian building.

I would be reasonably confident in offline games running in 20 years if you bought the cartridges, if you bought the estore versions I would be significantly less confident.