My ferret loves these.
While not the intended audience for this toy, my ferret is absolutely obsessed with these. He loves to stash them and every day we will spread them out for him to find and store again. He has been doing this for almost 1.5 years, so he is a big fan. Nothing makes me smile more than when I catch him running across the room with one of these in his mouth. He has 2 sets currently and we hope to get him more soon!