The incredible dinosaur that dominates the Earth Hall of the Natural History Museum is the most intact Stegosaurus fossil skeleton ever found. Measuring nearly 20 feet long from head to tail, around 90% of the skeleton is preserved, making it both incredibly rare and valuable. This is the story of its dramatic discovery and how this particular "roof lizard" is revolutionizing our understanding of this spiky giant. Stegosaurus was an armored vegetarian dinosaur that walked the Earth about 156-144 million years ago. Experts have been examining the skeleton since its arrival at the Museum in 2013--the first detailed study of a Stegosaurus since 1914--and the book explains what the results uncovered, with close-up imagery and special photography illustrating the key findings. Combining the latest scientific research into Stegosauruses with the story of its past, this book sheds new light on the mysteries behind the evolution and behavior of this iconic but poorly understood dinosaur species.