Sauruses or Saurii are big scaly lizard-like creatures of enormous appetites and very little brain and run around the forests or deserts.
Sauruses have highly developed hind quarters to run and small, under-developed front limbs to grasp food, a large mouth filled with sharp teeth.
Around Spielburg these creatures are dangerous monsters hunting adventurers (although easily defeated and usually the first monster a novice will ever slay easily), however the Land of Shapeir is home to a race of Sauruses which is domesticated, and used as a mount for traveling the desert. Wild sauruses are hunted for their edible meat.
These mounts are fearless, loyal, and quick to defend its master against monsters. Most critically, it can always find its way back to the place where it is stabled, so it never gets lost.