Bread is good to eat but too much bread say a loaf every day could make you fatter unless you have a high metabolism
The best type is any crusty bread that you like. The would include bagettes, chiabata, or any other good crusty bread.
No. Bread gums up the stones in the birds crop so that they cannot properly process their food. Bread has been the cause of death for some smaller song-birds. Ducks might be a bit more robust but...
no it humidifies.
cause it is nice with butter