The capture - Kathryn Lasky

Introducing the newest heroes to children's fiction; the owls of Ga'Hoole. Meet Soren and his friends, the owls charged with keeping owldom safe. Based on Katherine Lasky's work with owls, this adventures series is bound to be a hit with kids. Join the heroic owls in the first of a series of mythic adventures.

Out of the darkness a hero will rise.
Soren the enthusiastic and young owl is busy learning the rituals of being a barn owl- First Meat Ceremony, how to fly and of course, about the legendary Guardians of Ga'Hoole. However, his life is quickly transformed when he abruptly falls from his parent's cosy nest to the bare and dangerous forest floor.
Helpless, he is captured by evil chick snatching owls that bring him to St. Aegolius Academy for Orphaned Owls, where his identify disappears as he receives a number instead of a name.
Soren quickly befriends another young owl Gylfie, with whom he works to withstand "moon blinking" (brainwashing), and instead develops plans to escape.
But before long, Soren realizes that he in fact has already embarked on an extraordinary adventure with much more excitement in the future.