Rexes are dinosaur-like dragons who inhabit Dinosaur Land and other places, first appearing in Super Mario World. Their English name is the Latin word for "king", and is likely derived from the predatory dinosaur Tyrannosaurus rex. They are indigo-to-violet with a nasal horn, fangs, and small dragon wings, though they are flightless. They also wear big red shoes, similar to Yoshi. A recurring trait with all Rexes are their compressible bodies, as their stature becomes flatter when jumped upon.