Her Cyborg Lumberjack by Susan Hayes

Birds were her only passion… until she met him.
Rin has dedicated her life to the study of birds. When the military uncovers a lost project that results in a new avian species, they hire Rin to investigate what they’ve created… and how to best use their newest assets.
Rin wants more for her subjects than a life of risk and servitude, but keeping secrets from the military is a dangerous game… especially when playing alone.
This cyborg thought he was better off on his own… then he found her.
Infantry scout. Prisoner. Unwilling test subject. Axe has been many things in his life, but most of it he spent alone. Freedom hasn’t changed that. He protects the colony from a distance—patrolling the wild places others avoid.
He thought he had everything he needed until a chance encounter changes everything. Now he’s got a psychic hawk in his head and a bright and cheerful scientist sneaking into his heart.
She needs his protection. The psy-hawks need his help. And Axe is about to discover that a life of solitude isn’t what he wants after all.