After playing with these addictive electronic insects for a few days, I'd say Innovation First is really onto something special. I've posted a video, as they truly defy adequate description in words or pictures – you have to experience their frantic motion, seemingly intelligent interaction and eerily lifelike behavior in action to appreciate the concept. But as I have to write something, here's my best effort at describing Hexbug Nanos: imagine the Ant Farm you had as a kid (before you knocked it off the shelf) morphed into a Hot Wheels racetrack… amazing fun. Individual bugs about $10, expandable "Habitats" (which include one or two bugs) $15 – $50.  http://www.hexbug.com/nano