Actually, a mechanical fly seems to be the next item in line... except that mice wouldn't chase flies, no matter how high their IQ. Hmmmm... Traveler has already provided a couple of small nano-critters (they were in the PropsClub). That sends us to the other end of the lineup! :wide delightfully wicked grin: We now need (absolutely need) a mechanical horse. There was something like this as part of RDS4, IIRC, at least used on the art. Part of the Arabian Nights fairy tales dealt with a marvelous flying mechanical horse and a prince who was too besotted with it to ask how to dismount. We wouldn't need the wings (there are oodles of mechwings out there already so artists could add whichever ones they wanted). >>>IF<<< there was such a horse, we could start with the 'droid... he would chase the charger who hunted the hound who crept up on the cat who pounced on the mouse who wiggled the worm who....