I have seen 2 big cats, the first was south of canberra back in 1995, with another bowhunter. We both saw it, It was a tawny colour like a mountain lion, or Puma. It was much larger than I expected at least as big as a wolfhound. When we got to the spot where it had been sitting it had disappeared into the Blackberry thicket.
The hair on our necks stood up and we got out of there fast. The second occurred last year, I saw a large black cat for about 10 seconds before it disappeared behind a small hill.
The sheep in that paddock were bleating and ran down to where I was metal detecting, which was unusual. About 4 months later owner of the property saw it himself and took photo's of the tracks.