 Several older nonfiction books incorrectly stated that "Stegosaurus" had two brains, due to a mistake made by Marsh during the 1800s, in which a bundle of nerves located in the hips was thought to be a "second brain".However, newer informational works have corrected this, and most nonfiction dinosaur books published nowadays correctly state that "Stegosaurus" had only one — albeit tiny — brain, located in its skull, as all other known vertebrates do.