eyas

An eyas is a nestling hawk or other bird of prey that has not yet developed its flight feathers. This term is specifically used in falconry, the sport of hunting with trained birds of prey. Falconry has ancient origins and involves using falcons, hawks, and sometimes eagles or buzzards to hunt game.12

The life cycle of these birds includes a fledging period, from hatching to their first flight, which can range from about three weeks for small accipiters to four months for large eagles. During this time, the young bird grows to adult size and learns to tear prey brought by its parents. Immature birds typically have different plumage than adults, often being brown and streaked or spotted.34