The Encounter: The Graphic Novel (Animorphs #3)

When Tobias and his friends were given the power to morph, they were also given an important warning: Never stay in a morph for more than two hours. But Tobias broke the time limit and now he's trapped in the body of a hawk ... forever. When he discovers an important Yeerk secret, Tobias knows he has to do everything in his power to destroy it. But to do so, he'll have to contend with a part of himself that's wrestling for dominion. A part that isn't human. For Tobias, the fight against the Yeerks is more pressing than ever ― not just for humankind, but for his own humanity.