If we leave our sash windows too far open then we can guarantee we will have swallows in the house. One year they started to build a nest on top of the electricity meter so had to be evicted. As we have dogs it's not a good move for birds to come into the house.
One year we had Pooey Dooey (I'm sure I've told this tale on here before!), the racing pigeon. I was sitting in my living room when I had that creepy feeling of being watched when there was no one else around. I turned and looked above me to see a pigeon perched contentedly on top of the dresser. Of course we fed and watered him, he would pop outside for a fly around then return (via the window). Eventually we were able to pick him up and found a phone number stencilled on his wing. In very short order a large black very luxurious BMW pulled up outside. The owner told me Pooey Dooey was his best racing pigeon, worth a startlingly large amount of money. He had released the flock as part of a race from I think Newcastle to Glasgow, but they had been attacked and scattered by a peregrine. Some were killed, and PD appeared to be the only survivor. He was popped in a cage and driven off in regal splendour.
ps: no, there was no reward.