Three Billy Goats Gruff plus Facts about Goats

"Mama and Papa, I'm hungry!" says baby goat Gruff. Mama goat and Papa goat Gruff say, "Yes, we're starving, too. Baby goat Gruff asks, "Can we cross over the bridge to greener pastures?" Mama Goat and Papa Goat Gruff answer, "Yes, but a troll lives by the bridge. We have to use our wits to cross over the bridge without being eaten by the troll." How will the goats outwit the troll?