well-fledged
/ˌwɛlˈflɛdʒd/adjective
Fully covered in feathers; specifically (of a bird) having feathers and wing muscles sufficiently developed for flight; able to leave the nest; (figurative ) well-developed, well-established. Also of an arrow: = well-fletched.
Origin
Mid 17th century; earliest use found in Robert Baron (bap. 1630, d. 1658), poet and playwright. From well + fledged.