My husband does this every erev Shabbos and on Sundays, with whatever leftover challah or bread we have. It is amazing how the birds have actually come to EXPECT the bread on those days, and you can see them sitting patiently on our roof and nearby, or even sudddenly flocking to our home the second he walks outside on Fridays and Sundays. I call him the “Birdman of (our neighborhood).”
The birds come in droves (like a scene out of a Hitchcock movie). It actually could be a little scary to someone walking down the street, so he does it very early in the morning when few people are about. But it truly is amazing to see how they have come to depend on his being there at those times.