It is in their inner clock that tells birds when to leave. Just because you hang up a feeder does not mean birds will immediately flock to your feeder. If you do not see birds at your feeder in a month's time - move it. Sometimes a short distance is all it needs. Offering bread scraps.
Bread is a filler with no nutritional value.
Place feeders 8-10' away from any place they can jump from. Use baffles to prevent the from coming down from the top or up a pole. Only 1 Feeder. Hang a variety of feeders at different heights. Limit ground feeding - song birds usually use hanging or raised feeders.