My yard ducks love to hunt. So, we try to provide them with plenty of hunting places. The hay in their pen gets fluffed and then meal worms are tossed in there before bed. I don't rake, since the leaf litter hides scrumptuous critters to munch on. They love to dig, so we have mulched areas that are more for them than the plants they are "protecting".
So, when we get our two little baby fluffies in the mail around Jan 13th, we are going to have to start thinking of the same stuff as they get bigger, to teach them to hunt while still in the house and the weather outside is inhospitable to babies. We've decided to let them have a hunting ground as well. We will hide treats in their shavings to find, or in the sink when they bathe, or a place on the floor when they are allowed free range movement.
I think we will look into that treat ball as well.