Guardians of Ga'Hoole: Boxed Set 1-4 by Kathryn Lasky
Deep in the Forest of Tyto the adventure takes wing! Soren is born in a forest kingdom where barn owls have lived in peace for eons. But evil now lurks in the owl world, an evil that will shatter Tyto's peace and change Soren's life forever. In the first four books of this popular series Soren and his band make their way to the Great Ga'Hoole Tree where they will join with like-minded owls - honest, brave, wise and true - to boldly face danger and be tested in ways they never imagined.