Descent is a chapter in the Seventh Iteration.
Ellie and Gennaro join Grant in the dinosaur nest and hide behind some boxes. They see two adult raptors and some babies. Grant guesses there are at least thirty raptors in the nest, including four or six adults. He examines the first nest and counts the remains of fourteen eggs. After examining two more nests, he concludes that thirty-four raptors have been born. Ellie notes that when the raptors stand still, they all face a certain direction. She wonders whether it is ritual behavior. Grant thinks it may be a form of communication.