More like dont feed the ducks bread

Feed them halved grapes, oats, birdseed, pumpkin seed, duck pellets, corn, peas, barley and dark green leafy veggies like silverbeet and kale

Bread Over a long time can hurt them because of protein

its junk food, just empty carbs, they dont get the right nutrition and end up with the feather defomity "angel wing" and they arent able to fly
Also causes pollution and in cases when fed frequently leads to laying more eggs ending up with overcrowding and aggression issues

bread is bad bad bad