The pachycephalosaurus, its name meaning "thick-headed lizard," is known for its thick domed skull! In this hi-lo title, detailed illustrations welcome readers into the Late Cretaceous period. Leveled text shares how the pachycephalosaurus ate, survived, and eventually went extinct. Special features help readers visualize the dinosaur's diet, size, and more!

The world of the pachycephalosaurus -- What was the pachycephalosaurus? -- Diet and defenses -- Fossils and extinction -- Get to know the pachycephalosaurus -- Glossary.