Yes, in Oz we wave the Rainbow Serpent, or "Woggle".
It's a gigantic, massive, monstrous snake with rainbow coloured scale and usually a black head. It's believed in by almost all the different aboriginal language groups. Sometimes it's size is super massive (planetary), but usually it just gets as big as something like a mountain (when it was making rivers and other geological features), and sometimes it's as small as an aircraft runway.
The Rainbow serpent was responsible for creating Australia and all the land features during the Dreamtime. It's the most sacred creature/god that there is to native Australians.
Great… read about him in a Wiki article. And I find him interesting (given my fear of snakes).
I wonder how he would fare if he ended up fighting Jörmungandr (the giant snake from Norse Mythology, child of Loki, etc…)