Hi Trevor and welcome .
my sons birthday that that day so I'm out .
Biggest goanna I've ever laid eyes on used to hang at black rock
I swear the sucker was about 8 foot long ,A friend who worked for national parks reckoned it used to cause lots of problems trashing tents for food and tipping over rubish bins , he said they spotted it one day walking along the edge of the track carrying a large dead wallaby
long time ago thankfully ,so its likely long gone.... or gotten bigger