Those findings supported the move.
On day thirteen, the eagle was transferred to a larger but still controlled rehabilitation enclosure.
The new space had low perches at different heights and enough room for short flights without allowing high-speed movement.
The transfer itself was intentionally quiet.
The bird was placed in a dark transport carrier.
The carrier was moved directly from the private room to the rehabilitation building.
No public areas were crossed.
No unnecessary staff were present.
The door opened.
The eagle stepped out.
For several minutes, it stood on the floor.
Then it moved to a low perch.
That first afternoon passed without flight.
The next morning, staff found the bird on a higher perch.
No one had seen the movement, but the eagle had clearly climbed or flown there.
The first observed flight occurred later that day.
The bird launched from a low perch and crossed several yards.
Both wings beat strongly.
The body remained level.
Then came the landing.
The eagle approached the opposite perch slightly too high.
It extended both feet late.
Instead of settling cleanly, it touched the perch awkwardly, flapped hard to correct, and dropped to the lower platform beneath it.
The bird remained upright.
No injury occurred.
The flight had looked good.
The landing had not.
That single event justified every day of caution.
An eagle can appear normal while standing and still be unsafe to release if timing, depth perception, or coordination has not fully returned.
The team documented the landing.
The bird remained in the intermediate enclosure.
The next several flights were similar.
Takeoff strength was good.
Straight flight was stable.
Landings were inconsistent.
Sometimes the eagle judged the perch correctly.
Other times it reached too far or adjusted late.
Donovan could not say with certainty whether the problem reflected lingering neurologic effects, deconditioning, unfamiliarity with the enclosure, or a combination.
The answer mattered less than the functional result.
The eagle was not ready.
The rehabilitation plan shifted from medical stabilization toward coordination and flight assessment.
Perches were positioned at different distances and heights.
The bird was allowed to move voluntarily.
Staff did not chase it into repeated flights.
The goal was natural behavior, not panic-driven exercise.
Each movement was recorded.
Takeoff.
Altitude.
Straight-line control.
Turning.
Foot extension.
Landing accuracy.
Post-flight balance.
During the first week outside the private room, the eagle made measurable progress.
It began landing more cleanly.
The feet extended earlier.
The bird corrected its approach before reaching the perch rather than after contact.
Turning remained cautious.
The eagle preferred straight paths between familiar points.
That was not unusual for a recovering bird.
The staff wanted more.
A Bald Eagle in the wild cannot depend on predictable straight flights between padded perches.
It must respond to wind.
Moving prey.
Other birds.
Trees.
Uneven landing surfaces.
The bird would eventually need a much larger aviary.
Before that could happen, Donovan wanted consistent accuracy in the intermediate space.
The private room had taught the eagle’s nervous system to recover without constant stimulation.
The intermediate enclosure asked the nervous system to begin handling complexity again.
That progression was deliberate.
By the third week after admission, the eagle’s landings had improved significantly.
The bird no longer hesitated before short turns.
It could move between perches without obvious imbalance.
After flight, both wings folded normally.
The head remained level.
There was no delayed reaction to movement.
Appetite remained strong.
Body weight was stable.
The superficial wounds had healed.
Repeat blood work showed no new concern.
The team approved transfer to the full outdoor flight aviary.
This would be the most demanding test yet.
The aviary provided enough length for sustained flight and enough height for real climbing.
Natural branches created irregular landing surfaces.
The bird could choose among several routes.
Wind entered the enclosure.
Light changed throughout the day.
The environment was still controlled, but it was no longer simple.
The eagle entered the flight aviary in the morning.
It moved to a mid-level perch and stayed there for several hours.
Then it flew.
The first full-length flight was strong.
The eagle crossed most of the enclosure and landed on a broad branch.
The landing was successful.
The second flight involved a turn.
The bird took off, climbed, banked left, and approached another perch.
For a moment, it appeared to misjudge the distance.
Then it adjusted in the air and landed.
Donovan watched from outside.
That correction mattered.
A neurologically healthy bird should be able to recognize an error and compensate before contact.
The eagle had done so.
The next challenge was repetition.
One good flight could not establish release readiness.
Fatigue can reveal subtle neurologic deficits that are not visible in a rested animal.
The rehabilitation team therefore observed the bird over many days rather than forcing a single test session.
At first, the eagle flew only occasionally.
As confidence and conditioning improved, the frequency increased.
The bird began using the highest perches.
It changed direction in flight.
Landings became precise.
The feet extended at the correct time.
The eagle could approach narrow branches without overshooting.
No head tilt returned.
No abnormal circling appeared.
No balance deficit developed after exercise.
That was exactly the progression Donovan hoped to see.
The staff still waited.
A traumatic brain injury cannot always be evaluated through imaging alone.
Function remains central.
The bird had to demonstrate normal behavior repeatedly.
One afternoon, a sudden gust moved through the aviary while the eagle was crossing from one perch to another.
The bird adjusted its wings, shifted its tail, changed angle, and landed cleanly on a lower branch.
The movement lasted seconds.
To the rehabilitation team, it was one of the most reassuring tests of the entire case.
The eagle had responded to an unexpected environmental change without losing orientation.
The private room had done its job.
Now the bird was proving it could function outside it.
Body condition also improved during flight rehabilitation.
The eagle had never been severely emaciated, but the period of illness and restricted activity had reduced muscle tone.
Repeated flight rebuilt the pectoral muscles.
The bird’s weight remained stable.
Its appetite was strong.
It handled whole fish normally.
Preening behavior was regular.
The feathers around the old head abrasions had begun lying naturally again.
Nothing about the bird’s appearance suggested the nervous, poorly coordinated patient that had arrived weeks earlier.
Behavior toward people remained appropriate.
Whenever staff entered the aviary, the eagle moved away.
It did not associate doors with close human interaction.