This young Swallow had bumped into one of our windows. Fortunately I heard the impact and found it dazed on the ground. It crash-landed on the first release attempt so I put in in a dark box for 10 minutes' recuperation.
The second release was successful and it flew off to rejoin its family. Good luck, Swallow!
I wouldn't have heard the bang on the window if I hadn't been in the house trying to evict a(nother?) Swallow which had invited itself into the bathroom. It found its own way out through the spare bedroom window. Pesky birds.
photos taken with Canon Powershot A640