Robert Irwin Dinosaur Hunter 4: The Dinosaur FeatherDiscover a world of prehistoric dinosaur adventure with Robert Irwin! While spending time with the cassowaries at Australia Zoo, Robert mentions to Riley that many dinosaurs were also feathered. Riley thinks he's joking until the two friends zip back to prehistoric Asia, where feathered dinosaurs such as the Oviraptor and Yutyrannus huali roamed the land. When they find an abandoned egg, the hunt is on to return it to its rightful owner. Robert Irwin