Have you ever heard of an Elmosaurus? How about a Telly Rex? Join Sesame Street's curious red monster as he explores dinosaurs! What did dinosaurs eat? How did they move? What did they look like? And what would happen if Elmo, Telly, and Abby became dinosaurs?!?! All these questions and more are answered in this charming and informative story which features Dorothy, Mr. Noodle, new songs, and a dinosaur on Sesame Street!