This is goanna Rum, seen three days earlier in Tyson St Ainslie, Varanus rosenbergi (Heath or Rosenberg's Monitor) He is one of a handful of Rosenberg's Goannas remaining in the Ainslie-Majura reserve. They are the last population of goannas in Canberra, where once there were multiple populations of each of two species.
Yeah, what a great sighting! Im concerned though about the dogs of leash. Last Thursday 27 Nov, evening, a German shepherd dog chased kangaroos east of the Fair. Some people ignore posters and regulations. BTW, I counted 27 kangaroo on flight in a line - there might have been more.