LOST BIRD: Hampden, Baltimore (Baltimore)

Our cockatiel flew out the door on 2/13/24 at around 4:30 pm and we haven't been able to find him.
We are on the 1400 block of Yeager St.
in Hampden, and he flew kind of in the direction of Sweet Air (but was panicking and going in many directions).
His name is "Das Bird" and he responds to the whistled song "Good Morning" from Singin' in the Rain.
He has a grey body with white on the wings, a yellow head, and orange cheeks.