I propose a device for the bottom of doorways that sends a non-lethal shock to anything that runs through it that isn't a certain pre-determined height. Hopefully, this will deter mice and other tiny rodents from entering or remaining in your home. I realize they don't usually come in through the door, but hopefully they'll associate your home or apartment with bad vibes. 1st time poster, so go easy on me.-- goober, Dec 09 2002 Flo control project http://www.quantump...rol/flo_control.htmImage capture/recognition system controls a cat door. [krelnik, Oct 05 2004, last modified Oct 21 2004] Reminds me of an image recognition technology company that built a prototype cat door that could "recognize" the cat(s) that lived there, and whether they had any prey in their mouths. See link.-- krelnik, Dec 09 2002 [waugs] - I stand by the door with a measuring stick and a cattleprod - ready to strike down any little critter that tries to get in. (I'm not sure if I'll shock 'em with the prod or bludgeon them with the stick - either way will be fun)-- Jinbish, Dec 09 2002 What's to stop the mice from standing on each-other's shoulders to look bigger?-- dalek, Dec 09 2002 The floor could be shaking and vibrating - making rodent acrobatics very difficult. Only an expertly trained troupe of possums will be good enough to get through. <senses some kind of mouse-trap-ease pun coming>-- Jinbish, Dec 09 2002 Build a better trap path and the mouse world will be beat and pathed out at your door.-- FarmerJohn, Dec 09 2002 A little voltage beam between the doorjams. I've seen the cat door thing, but this would just need sensors: one lower to detect movement, and one a little bit higher to detect whether it was a rodent or human or pet...although a cat getting zapped would be fine too...-- goober, Dec 09 2002 You must be at least *this* tall in order to live. Have the device zapping and popping until it *sees* something over a certain height.-- thumbwax, Dec 09 2002 random, halfbakery