The other day I happened to be hanging around the house, which is rare, and heard a loud "thud". Prior to the thud I heard a lot of cardinal twitters outside my dining room windows .
Let me say that we have many cardinals around here, and cardinals have multiple nests/families throughout the year. That morning I noticed the adult cardinals feeding the grown babies suet from our suet feeder. The grown babies always love to be fed, even though they are adults themselves, and they tweet like little babies.
After the "thud" I found this grown male baby cardinal laying on the windowsill. Evidently he flew into the window. Hard. He was shaking, his eyes wouldn't focus, his toes were curled up into a fist. I didn't think he was going to make it.
The little cardinal laid out on the window sill for quite a few hours. I checked on him about every 30 minutes and could see him breathing. I made sure my inside cats didn't notice him out there so they wouldn't torment him by staring at him through the window. The outside cats weren't around, either.
When it started to get dark out, I figured the little guy had to be checked out. He couldn't stay out there all night, the night animals would find him, and he'd be blind in the dark and couldn't attempt to fly to safety. If he could even fly.
He was still breathing. I tapped on the window, and to my surprise he was able to focus his eyes on me then! He was coming around! He still didn't fly away, but it appeared he was waking up, coming out of his stupor. He looked all around, confused as to why he was laying on the windowsill. After a few minutes he still laid there, and the sun was setting fast. If he could fly, he had to attempt it immediately before it got too dark out. Darkness comes upon us fast when the sun sets.
And so I started opening the window. I was going to put him in a little cage or something where he could get some rehab until he was able to fly and go free. By all means, I certainly didn't want to have a cardinal in the house, but I couldn't let the little guy just lay there and be eaten by an owl overnight.
The little cardinal wanted nothing to do with me! As I opened the window, he immediately looked around, and with a loud baby cardinal twitter, he flew to the tree where the cardinals live! He was better! He didn't fly in a straight line, but he flew well enough to make it. He left behind a huge poop on the windowsill.
The little cardinal boy lived to see another day! I bet he had a headache!