How To Tell If A Book Is Nonfiction?. Realistic pictures.Facts.Animals in the book do not talk.. How To Tell If A Book Is Fiction?. Pictures are not realistic.Opinions are often used in the book.Animals in the book talk.. Lesson Plan. Read the book The Very Quiet Cricket by Eric Carle (Fiction).Read Monster Bugs by Lucille Recht Penner (Nonfiction).Do a Venn Diagram on the differences in the two books. .