Had an experience with one these cute l'il gaffers today- well ok, they're not called gaffers, it's a Warbler. Poor thing flew into a window at work. He stayed where he landed, upright but not moving for a long time - a good few hours. He seemed to have an injured wing, only one eye was opening, and the tip of his little beak was bent. A couple of us took trips outside every half hour or so to see if he'd moved - he hadn't. He wasn't in the best spot - by a bike rack, and vulnerable to predators or just being stepped on by passers by. He had a collection of fans after a while, also checking on him - on one of my visits to check on him I was touched to see an attempt by some kids (I assume) to provide sustenance - there was a Dorito and a little puddle of soda pop on the sidewalk beside him!
Anyway, after much ado, we decided to place him in a little basket and put him in a corner with some water where he was a bit safer. By this time I'd decided if he hadn't moved by the end of the day, he was coming home with me - to either die in peace or recover.
This has a happy ending - on our last check on him, he had finally flown away. Happy me.