We got a Nano Bug for Christmas. It is like a robotic bug that vibrates around the kitchen floor. We had another one that never really got our attention, but this one has a fuzzy purple tail, and we really like to hunt this one.
Here's Maggie and Huggy Bear investigating the bug. Huggy Bear is really drawn to purples and pinks for some reason, so he was all over this guy.
Huggy Bearin action -- whapping the tail to check things out.
Of course, no hunt is complete until you put your mouth on it. Huggy Bear got a little excited and almost ate the purple tail, so Dad put it away on an old bread in the kitchen. We usually ignore that table, but Huggy Bear wouldn't be denied, and continued to look for the bug and found it on the table. Dad eventually had to put the bug in a drawer and give Huggy Bear some treats for all his hard work.
Our bug came from Target in the cat toy section, but they have other versions with the kid's toys too. If you don't have one, I highly recommend getting one.