What is the relationship between Frightful and Chup?

Chup is a male peregrine falcon, about nine years of age, who first meets Frightful while seeking a mate to serve as a surrogate mother to his three baby birds. Chup lives in the cliffs above the Schoharie River, and is puzzled by Frightful’s seeming lack of natural instinct, though in time, she comes into her own. Chup flies south for the winter, and when he returns in the spring, tries to get Frightful to mate with him, but she will not do so. He then heads to find another mate and raise another nest of children, before heading south again for the winter. When he returns in the spring, he consents to living with Frightful in the town of Delhi, and there mating and nesting to raise another nest full of babies.