My 6 year old does the same thing. We had caterpillars, one legged grasshoppers and frogs. Most of them lasted about a month before I let them go. Mind you this was early summer. I am glad to know that I am not the only Mom who has a zoo in her kitchen.I wiould put fresh leaves in as I believe that is where they get thier water intake from. Good luck I hope he makes it through the weekend.