Those things are just great. I have two cat and of course had the same test the reactions. One looks only at a distance and at a safe accompaniment on - but also the more anxious of the two :-). But he is fascinated by the observation all. The other runs to Hochstform on as hunters, similar actions I've seen in wildlife documentaries when Meerkats hunt scorpions. Tatzeln - withdrawal - slam - toss - secure. Just great by the unpredictable changes of direction. But really works only on smooth surfaces. I would buy it immediately!