Exploring dinosaurs

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this armor-plated dinosaur.

Provides a description of the allosaurus, a dinosaur species that lived from about 156 million to 144 million years ago, discusses the history of allosaurus discovery and study, explains what scientists have learned from a complete allosaurus skeleton found in 1991, and speculates about the extinction of the dinosaur.

Describes what is known about the body, movements, and hunting methods of "Tyrannosaurus rex" and discusses the first discovery of a tyrannosaur and the unearthing of "Sue." Includes a glossary, a geologic time scale, and a list of places to visit or contact.