A Greater Hill Mynah fledges at roughly twenty-five to twenty-eight days of age, leaving the nest cavity able to fly but distinctly unpolished about it. Early flights are strong in propulsion and poor in braking, and a newly fledged mynah will regularly overshoot a perch, hit a wall, or land on the floor and sit there looking affronted. This is normal, and it resolves over one to two weeks of practice.
The fledgling's first enclosure should therefore be wide rather than tall. Mynahs are not climbers; they have no zygodactyl grip on cage bars and no beak-over-foot ladder technique. They hop and they fly, which means horizontal distance is the dimension that matters. Set perches low and near opposite ends so the bird can make short flights without a long fall, and pad or cover any hard surface it is likely to strike in the first days.
Independence does not arrive with flight. Wild parents continue feeding fledglings for several weeks after they leave the nest, and a hand-reared bird follows the same schedule, begging with quivering wings and a raucous call long after it can technically feed itself. Continue offering hand feeds while introducing solid food, and let the bird refuse feeds rather than withdrawing them on a calendar.
Safety in the household changes at this point too. A fledgling mynah out of its cage will fly into windows, mirrors, open water, and cooking surfaces without hesitation. Cover glass, close toilet lids, remove standing water deeper than the bird's own height, and confirm every door before opening it. Most fledgling injuries in this species happen in the first fortnight out of the nest, when flight capability has arrived well ahead of judgement.