For a while, Red and her pack are happy, feeding off the plentiful carrion left by receding flood waters, but the pack's way of life is upset by an invasion of large "Acrocanthosaurus", huge meat-eating dinosaurs. The added competition for food puts strain on the pack, as does the unexpected death of one of the chicks. A fight erupts between the male raptor and Red's sister. Red, torn between a prospective mate and her kin, tries to defuse the situation. Two "Acrocanthosaurus" watch the commotion and take the opportunity to attack the "Utahraptor". Meanwhile, a "Kronosaurus" ambushes one of the chicks on the beach. Seeing the danger, Red lures one "Acrocanthosaurus" into deep water where it is dragged under by the "Kronosaurus". Red saves her family, but her consort is forced away by Red's sister.