If you use gravel to cover their run, wouldn't that keep them from being able to forage? Which would in turn cause them to only be able to eat the store bought feed and any scraps you throw them in the morning?. We are new to ducks (just got ducklings two days ago) and they love that their temporary run allows them to forage. I imagine if it was covered in gravel or a mat they would not be able to forage at all while we are away at work. However it is VERY wet (attracting lots of flies already) and as they are still fairly young they are making a huge mess! We are in the process of building their home which I know should have a hard floor, but I am really wondering about their run.... eventually they will free range, but until then I am unsure of what to do. Any thoughts?