He begins a courtship dance for Red, but Red's sister chases him off, hissing. Her growls agitate the "Iguanodon", who stampede; the male hastily leaves. After climbing into a tree to escape a flash flood, Red encounters the male raptor again, who performs a courtship dance while hanging onto the tree branches. Red's sister begrudgingly allows the male to stay with them, provided he steers clear of her chicks. 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 the female "Acrocanthosaurus" into deep water where the larger predator is dragged under by the "Kronosaurus". Red saves her family, but at a price—her consort is forced away by Red's sister. Facing continual threats from the "Acrocanthosaurus", Red, her sister and the chicks are forced up into the mountains. They encounter ice and snow for the first time, and kill a segnosaur in a cave, turning the den into their nest. The older chick accompanies the two adults on hunting expeditions. One day the raptors encounter a strange creature they have never seen—a whip-tailed diplodocid who inflicts wounds on Red and her sister; the older chick is forced to set off alone and find the pack's food. This calamity coincides with the arrival of a large pack of smaller raptors known as "Deinonychus". Sensing the weakness of the "Utahraptor" pack, they surround the nest and wait for the wounded raptors to become weak enough to attack. Red's sister dies, and Red is crippled and defenseless against the smaller dinosaurs. The "Deinonychus" close in and wait for Red to die, but are driven back by a sudden attack—the older "Utahraptor" chick returns with Red's consort to defend the nest, driving back the "Deinonychus".