Science, Tech, Math › Animals & Nature Brachylophosaurus Share Flipboard Email Print Brachylophosaurus (Wikimedia Commons). Animals & Nature Dinosaurs Herbivores Basics Paleontologists Carnivores Dinosaurs & Birds Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated March 17, 2017 Name: Brachylophosaurus (Greek for "short-crested lizard"); pronounced BRACK-ee-LOW-fo-SORE-us Habitat: Woodlands of North America Historical Period: Late Cretaceous (75 million years ago) Size and Weight: About 20 feet long and two tons Diet: Plants Distinguishing Characteristics: Thick, downturned beak; short crest on head; susceptibility to cancer About Brachylophosaurus Three complete fossils of the hadrosaur, or duck-billed dinosaur, Brachylophosaurus have been discovered, and they're so amazingly well-preserved that (as paleontologists often do) they were immediately given nicknames: Elvis, Leonardo and Roberta. (The same research team also unearthed a fourth, incomplete fossil of a juvenile, which they dubbed Peanut.) The most completely preserved specimen, Leonardo, is the subject of a Discovery Channel documentary, Secrets of the Dinosaur Mummy. In this show, it's revealed that Leonardo had a birdlike crop on its neck (presumably to aid in digestion) as well as different-sized scales on different parts of its body, among other unique anatomical features. Although it's named for the unusually short crest on its head (short, that is, for a hadrosaur), Brachylophosaurus stood out more for its thick, downward-turning beak, which some paleontologists take as evidence that the males of this genus head-butted one another for the attention of females. This dinosaur is also known for its unique pathology: detailed analysis of various fossil specimens in 2003 revealed that these individuals suffered from an assortment of tumors, and one was in the end-stages of metastatic cancer (which may either have killed this dinosaur, or weakened it sufficiently that it was easily picked off by a hungry Tyrannosaurus Rex).