Mythosaur
this ancient reptile was once native to the planet Mandalore, until Mandalore the First and his warriors conquered the planet and wiped out the mythosaurs. It was generally believed that the skull-shaped markings on the armor of Mandalorian shock troopers was a stylized mythosaur skull, as an homage to the greatest predator to walk the surface of Mandalore. It was later discovered that the image was actually a reverential symbol for an ancient combat trainer.