Book three in Robert Irwin's exciting book series. Discover a world of prehistoric adventure and dinosaurs. Robert and Riley get pulled back in time to Alberta, Canada, during the Late Cretaceous period, to find a heavily armoured euoplocephalus trapped in vines. The rescue doesn't go according to plan when a ferocious gorgosaurus arrives on the scene, looking for a snack! Featured Dinosaur: Euoplocephalus. These armour-plated dinosaurs weighed up to two tonnes and had a club-like tail they used when threatened. Covered in thick spikes, even their eyelids were armoured.