
by Susan Heinrichs Gray, Todd Marshall
"Life was often difficult for the Iguanodon. It couldn't fight larger dinosaurs with sharp teeth or pointy spikes. Even thunderstorms could pose a danger. Learn how Iguanodon survived on Earth for nearly twenty million years and why its fossils have been discovered all over the planet. Additional features to enhance comprehension include informative sidebars, a glossary of key words and phrases, sources for further research, a Did-You-Know section, and an overview of the geologic time scale."--Publisher description.
24 February 1954
Susan H. Gray holds bachelor's and master's degrees in zoology from the University of Arkansas in Fayetteville. She has taught classes in general biology, human anatomy, and physiology. She has also worked as a freshwater biologist and scientific illustrator. In her twenty years as a writer, Susan H. Gray has covered many topics and written a variety of science books for children. [source](https://books.google.com/books/about/The_Life_Cycle_of_Birds.html?id=vgPcer9XUJgC&source=kp_author_description)
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