Sesame Subjects: All About Dinosaurs is a 2009 Sesame Street book and CD set in the "Sesame Subjects" series. In the book, Professor Grover teaches Elmo and the readers all about dinosaurs - about how they hatched from eggs, what they ate, what protected them from harm, where they roamed, and how they became extinct. The book also explains what paleontologists do and how they learn all about dinosaurs. The zippered casebound hardcover book includes a read-along CD with songs, games, activities and a fold-out poster.