Gray, Susan Heinrichs

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this plant-eating, duck-billed dinosaur.

Provides a description of the iguanodon, a dinosaur species that lived from about 132 million to 100 million years ago, discusses the history of iguanodon discovery and study, and looks at what the iguanodon did every day, and where it lived.

Provides a description of the edmontosaurus, a dinosaur species that lived from about 72 million to 65 million years ago, discusses the history of edmontosaurus discovery and study, explains what scientists have learned from a complete edmontosaurus skeleton fossil found in 1909, and speculates about the extinction of the dinosaur.

Provides a description of the diplodocus, a dinosaur that lived from about 150 million to 144 million years ago, discusses the history of diplodocus discovery and study, looks at different species of diplodocus dinosaurs, and speculates about their extinction.

Provides a description of the compsognathus, a dinosaur species that lived about 150 million years ago, discusses the history of compsognathus discovery and study, and speculates on what life was like for the compsognathus during the Jurassic period.

Provides a description of the coelophysis, one of the earliest dinosaur species on Earth, discusses the history of coelophysis discovery and study, explains what scientists have learned from a bed of coelophysis bones uncovered in 1947, and speculates about the extinction of the dinosaur.

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this huge plant-eating dinosaur with the long neck and tail.

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 the physical characteristics, movements, diet, defenses, life cycle, and modern relatives of the prehistoric pelycosaur.