The Giant Dinosaur

A billboard advertises a real live dinosaur so Zorori and the boars go to see it. The dinosaur turns out to be a child and Zorori decides to capture his own dinosaur. They find one on a southern island and discover the dinosaur is a mother and figure out the dinosaur they saw was her kidnapped son. They all go back to where he is being held captive and free him. Based on book 7.