Question: what can you feed ducks?
Answer: Sweetcorn. It turns out that ducks are quite partial to a sweetcorn. ... 
Lettuce. As a nation we're guilty of throwing away a vast amount of lettuce, especially the bagged variety. ... 
Frozen peas. There's no need to cook them but make sure you defrost them first!
Oats. ... 
Seeds. ... 
Rice.