Fang by James Patterson

Max Ride and her flock of genetically engineered bird-kids face one of their greatest challenges when Fang, Max's closest friend and love interest, leaves the group after receiving a terrifying prediction about the future. As danger grows and loyalties are tested, Max must lead the flock through new threats while dealing with heartbreak, difficult choices, and the possibility that their destinies may be impossible to escape. Packed with action, adventure, suspense, and science-fiction elements, Fang continues the fast-paced journey of the flock as they fight to protect themselves and the world.