A type of species that can be found in almost every Zone of The Seven Realms, some regions more, other regions not at all. They are several sub species of Stegosaurus too.
Stegosaurus are mobs who will always stay at the same spot. When you are 5 levels higher or lower, they will not attack you anymore.
A summary of all the Lizards in the game: Category:Stegosaurus.