When i learned about bread years ago, i went outside with all the peas and goodies i could find. The ducks approached me, waiting for some bread. I gave them peas and they did not understand what it was and refused to even inspect it. It ended with me giving up, laying it on the ground and retreating. And even then, they did not bother to check…
I don’t think they ever had been fed anything other than bread. They had no idea that i was offering them food. I’ve also never seen anyone feed them something healthy. Honestly, i think most people here have no idea whatsoever that bread is unhealthy and also disrupts the peace and quiet of female ducks; a study showed that ducks were fed so much bread that the males had basically all day to chase females around.