I knew it!!! According to Gnat Geo. the ancestors of the Kokomo dragons walked upright as the picture shows though not quite like humans.
Because of their large size they've been designated Lardis Rapporsaurs, or “Lardi”, and rapporsaurs because their small lungs made them breathe hard in the heat of the outback, sounding like this, “baaphuttt, ba-babba, ba-phuffft”.
But it seems the giant lizards, unlike the fellow in the picture, were heavily feathered and when they ate fermented watery berries to cool off, they became drunk and while lounging around they were killed by the Abridgeknee peoples who still wear feathers on their heads to honor the extinct lizards.