The Three Billy Goats Gruff: Tale vs. Truth

Are there any elements of truth in The Three Billy Goats Gruff?
Goats will headbutt each other, but they don't attack predators… and there are no trolls for them to throw off bridges! Integrating science with literacy, this book adds funny "Truth Time" sidebars to a retelling of The Three Billy Goats Gruff, explaining real goat behavior. Includes discussion of fairy tale traits, fictional vs. real comparison chart, glossary, and book and website resources.
Perfect for young students just learning about fiction and nonfiction and real versus not real, this title supports CCSS standards for reading literature.