Read and find out about dinosaurs big and small in this colorfully illustrated nonfiction picture book. Some dinosaurs were big. How big? As long as four school buses in a row as heavy as sixteen elephants. Some dinosaurs were small. How small? Read and find out in this clear and appealing science book for early elementary age kids both at home and in the classroom. This is a Level 1 Let s-Read-and-Find-Out which means the book explores introductory concepts perfect for children in the primary grades. The 100+ titles in this leading nonfiction series are: hands-on and visual acclaimed and trusted great for classrooms Top 10 reasons to love LRFOs: Entertain and educate at the same time Have appealing child-centered topics Developmentally appropriate for emerging readers Focused; answering questions instead of using survey approach Employ engaging picture book quality illustrations Use simple charts and graphics to improve visual literacy skills Feature hands-on activities to engage young scientists Meet national science education standards Written/illustrated by award-winning authors/illustrators & vetted by an expert in the field Over 130 titles in print meeting a wide range of kids scientific interests Books in this series support the Common Core Learning Standards Next Generation Science Standards and the Science Technology Engineering and Math (STEM) standards. Let s-Read-and-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.