Book five in Robert Irwin's exciting book series. Discover a world of prehistoric adventure and dinosaurs. A camping adventure unlike any other! Robert is out camping in the outback with his family and Riley. The boys can hear dingoes howling to one another, and they imagine what it might have been like to hear muttaburrasaurus calling to one another. The fossil takes him back to the mid-Cretaceous in the dead of night, where they experience firsthand the unusual call of the wild.