Dawn breaks over a sprawling forest in Cretaceous North America -- a dawn far colder than its peaceful, forest-dwelling herbivores are used to. The seasons are changing, and it's time for the able-bodied to migrate south. But the trek is a dangerous one even when massive herds band together, for while there is safety in numbers, numbers also draw attention, and the carnivores are moving in! This journey may not last long when the first hunter arrives, a ferocious tyrannosaurus rex who has her sights set on a young triceratops!
