This incredible book contains a free-standing and easy-to-assemble model showing the skeleton, muscles, and internal organs of a T. Rex based on the latest scientific understanding. Brilliantly educational, the book is full of fun and interesting facts from the dinosaur age. This incredible book contains a free-standing and easy-to-assemble model showing the skeleton, muscles, and internal organs of a T. Rex based on the latest scientific understanding. Brilliantly educational, the book is full of fun and interesting facts from the dinosaur age.