The Battle Begins — Devon Hughes

His back arched, the fur standing on end as the feathers started to push through and unfurl.

Castor has always been a stray. He knows no other life than the one he has spent in the back alleys of Lion's Head, prowling with his pack.

That is, until the day that he's captured and taken to a dark laboratory full of terrifying creatures.
They're called Unnaturals, and they were created to fight. What Castor doesn't know is that he's about to become one of them.

Soon Castor is transformed from a German shepherd mutt into a powerful beast with huge eagle wings. As he's thrust into the ring, he knows he'll need all of his courage to survive. But it will take unexpected human and animal allies and something even more than courage for him to save the Unnaturals....

Perfect for fans of the Animorphs and Warriors series, Devon Hughes's exhilarating debut is full of friendship, heroism, high stakes, and epic adventure.