What I gave him:
O'Ghomoro berries
Plumage will change in 6 hours.
O'Ghomoro berries
O'Ghomoro berries
Starting to grow new feathers!
Plumage will change in 5 hours and 59 minutes.
Xelphatol apple
Starting to grow new feathers!
Plumage will change in 5 hours and 59 minutes.
Mamook pear
Starting to grow new feathers!
Plumage will change in 5 hours and 58 minutes.

Waited for 6 hours.

Result:
Cork Brown