The Capture (Guardians of Ga'hoole, Book Read the whole series by Kathryn Lasky -- great for children and adults. Then move on to the Wolves of the Beyond series. No, I don't work for Scholastic.
legend of the guardians owl images
Martin - Guardians of Ga'Hoole Wiki
Guardians of Ga'Hoole: The Rise of a Legend out august 2013