The lizard is an abnormally large goanna lizard, and was about 5 feet long. There are 20 different species of goanna lizards, all varying in size, but clearly 5-foot-long goannas don't normally wander around backyards. If I found something like him randomly straddling the side of my house, I would absolutely lose my shit.
Reasons I am NEVER moving to Australia.
Props to Holland for totally keeping his cool enough to snap a picture. That would NOT have been my first thought.