Gorge have a thing for white animals. They had at least a dozen white macropods (probably closer to two dozen individuals) in at least 4 different species, the white magpie, peafowl, white phase goshawk, and cream wombats. But the surprise for me was the almost all white Black Swan.
As discussed in other threads, there is little conservation value in these animals (they are common species anyway) and inbreeding them is pointless in the long run anyway. but for a small privately-owned fauna park, they are a valid visitor drawcard.