I found a female cardinal incapacitated on the ground that had obviously flown into our window . They often recover quickly but she did not. She could cling to your finger and her eyes looked alert but she did not move at all. I thought the warmth from my hand might revive her but no. After about fifteen minutes, I brought her inside and put her in a little cage. She still didn't move at all but watched my movements and could turn her head a little. After about an hour, she started jumping around in the cage. Fearing she would injure herself in such a small enclosure, I released her on the deck. Good luck little bird.
Amy Grant and CeCe Winans