I have an idea I want to try. I found the PetSafe 5-Meal Electronic Pet Feeder online and should be getting it sometime today. I have three hens and figure they eat approximately one cup of layer feed a day (not counting the treats, BOSS, apples, etc I also give them). This device has 5 bins (each hold a cup of food) which can be rotated according to a digital timer program that the user sets. Had this idea: What if I alternate filling the bins; full, empty, full, empty, full,,,, and so forth...? I could program the first bin with food to be available. When nighttime comes I would have programmed the feeder to move to the next bin which would be empty (nothing for the mice to eat) then come morning, program a feeding then,,, the bin rotates to the bin with food,,, and so forth..... Seems like this might work? Only problem is that I'm guessing that eventually mice could eat through the plastic to get to the other bins. Anyway, I am going to try the experiment (after I am sure that the device will work properly inside the covered run area). I'd likely keep the regular feeder out for the first week just to be sure the device was going to function reliably.