Chapter Four sees a pack of Deinonychus stalking an old and dying sauropod; when it collapses, and dies, they move into to try and begin feasting, only to be confronted by a large group of other predators, including a Carnotaurus and an Oviraptor. The Deinonychus pack is split, as one of the raptors wants to fight the other group while the other insists on retreat. This leads to a battle for leadership. The surviving raptors return to their lair in the middle of a rainstorm, only to find the Tyrannosaurs waiting; the larger predators attack, and a massive battle ensues. The fighting causes the cliffside the raptor's lair is perched on to collapse, sending all of the animals plunging into the gorge. A single Tyrannosaur manages to survive the fall and returns to its own lair, only to find that the early mammal the juvenile Tyrannosaur had tried to hunt earlier had eaten the last remaining egg...with the story ending there.