In many hadrosaur and theropod dinosaurs, the caudal vertebrae were reinforced by ossified tendons. There is a parallel here with the hadrosaur and ceratopsian dinosaurs of the Late Cretaceous. The second chapter begins with another Tyrannosaur hunting down and killing a hadrosaur. Sub-centimeter fragments of pebbly-textured hadrosaur eggshell have been reported from the Dinosaur Park Formation. For example, in the Dinosaur Park Formation, fossil hadrosaur eggshell is rare. Neonate sized hadrosaur fossils have been documented in the scientific literature. Oregon's only dinosaur fragments, those of a hadrosaur or duck-billed dinosaur, were found here. The "Missouri Dinosaur," a hadrosaur (duck-billed), was discovered at a dig near Glen Allen. In 2009, a leg section from a duckbilled dinosaur called a hadrosaur was found. Horner's team prospected in the area where Brandvold found the baby hadrosaur fossils. The toothless portion of the anterior mandible was relatively longer than in any hadrosaur. Tiny hadrosaur footprints have been discovered in the Blackhawk Formation of Utah. The fossil record shows a staggering variety of hadrosaur forms in Laramidia. In 1979 Horner and Makela referred these hadrosaur bones to "Maiasaura peeblesorum". It soon stumbles upon the remains of a killed hadrosaur and becomes wary.