If your Cup of Caterpillars™ has moisture in the cup, the cup most likely is not in the best location. Condensation is not good for your caterpillars, but don't open the cup to wipe it out. Opening the cup can introduce harmful bacteria to your caterpillars. Instead, place the cup in a cool dark room and wait for the condensation to dissipate. Once the condensation has disappeared, place your caterpillars in a spot away from any sunlight or heat sources to observe them.