This new fledgling learned just that lesson yesterday afternoon. It's difficult to learn how to fly. This one flew right into the door, no windows to fool it, just a solid door. Kathump! I wondered what the sound was. There sat the poor bird, dazed, eyes half closed, legs danging in this crack wings spread. I did not disturb it because it was still breathing.
I kept checking through the window, hoping it would revive. Such a pretty little thing I took no pictures through the window then waiting for the happy pictures of when it revived.
It slowly came around gathered its feathers properly about and rested for some time. Later, it had flown away to learn more life lessons, hopefully easier than this one was.