will the durks eat the hay or just play in it?
Hay and Straw are two different things, different parts of different plants. Hay is often used as a feed source for assorted livestock, straw is generally used as bedding as the nutritional part of the plant has already been harvested and used in other products. I use straw as bedding. The ducks make nests in it. When I put fresh straw in the do noodle around in it and I suspect they find some seeds (and maybe bugs) to eat, but it is not a significant source of nutrition.