Frog is lost, looking for his dad. But his dad doesn't roar, does he? Maybe he whoops or squawks or growls instead? Find out in this hilarious changing faces book. Small children love to read books about animals and to see animal characteristics displayed through their sounds and expressions., Simply by turning the page, the Venetian movement causes the animals' expressions to change from sad to happy, tearful to joy, sleeping to wakefulness. The effect is both fun and exciting, and an effective way of both enhancing storytelling and learning about different facial expressions and the emotions they convey.