Theme: Sea Monsters, mysteries, curiosities. Do monsters really lurk in lakes, oceans, and other bodies of water, or are there scientific explanations for the stories about these beasts? Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4–7. Visually appealing fullcolor photographs and illustrations—along with fun fact boxes—keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.