A Breed Apart (1984)

Jim Malden (Rutger Hauer), a Vietnam vet who's lost his family, lives virtually alone on a bird-filled island, where he's a committed conservationist. When rock climber Mike Walker (Powers Boothe) is hired by passionate egg collector J.P. Whittier (Donald Pleasence) to steal the eggs of the rare bald eagle, which lives on Malden's island, he tells Malden he's a nature photographer to gain his trust. However, Malden's infectious passion for the wild forces Walker to reconsider the plan.