The Ultimate Pet Duck Guidebook has a section on enrichment. When I get an opportunity I will look for that here (I may have "reorganized" it) and share some of the ideas in that book. Majestic Waterfowl's site may have a little of that on their pages, I don't recall.He doesn't react to mirrors. He doesn't even really seem to like baths, either, which is weird. And I dunno if I can handle the mess that potting soil would bring, hehe! I do like the string idea, though. His favorite things EVER are hair ties, he'll chase them, nibble them, toss them, you name it! Maybe I should get a laser pointer...I just feel bad, I feel like I'm not enriching his life as much as I could be, you know?