Excellent photo Chris. I havent seen the stripe on the back of this wallaby in other photos. Yours is by far the best photo. (Or could there be more than one such wallaby on Mt Majura? - I doubt it).
May be acromelanism as seen in 'sealpoint' siamese cats. Apparently the same genes are involved in Leucism and Acromelanism so acromelanism may be a form of leucism, or they may be different forms of the same thing.
I thought this kangaroo looked a bit thin. Perhaps that has something to do with the number of rabbits. Kangaroos are in suburban gardens even during the day.
I saw one in Namadgi many years ago that was circled sideways like a pig tail - roo could still move at speed. This one may have been more recent, as it looked like there were some partly healed wounds on the top of the tail - but may have been due to the deformity rather than recent injury.
Hi John.Butcher, thanks for your sighting. The media you provided is missing or unclear. To help us verify this sighting, please provide additional media.