Suppose you were hunting around in the desert for a fossil and instead you found a real (and very large) dinosaur, genus Stegosaurus. Joan and Joey Brown did! Nobody believed they had found one, which was just as well because George (as they called him) was very shy.
He was a loyal friend, doing his best to help the twins make money to finance their mother's dry little ranch on Cricket Creek. George ate sagebrush, looked for fossils, and fought an plane (which he thought was a pterodactyl) with faithful enthusiasm, but his walnut-sized brain often made him more hindrance than help. Especially when he went after the bank robber!
This story is told so convincingly that you'll be looking for dinosaurs around every mesa. And who knows? Maybe you'll find one!