I have a 4-5 month old veiled and I have fed many superworms, some froma cup, some with the long tweezers, some I stuck to the screen near the Cham and I have even left them free in the enclosure. The Superworms tend to crawl up the screen and he would pick them off. I did find a few managed to escape or tuck themselves tightly into the corners but I would say of the free ones 95% get eaten by the cham (I suppose the rest escape or die and desicate. The superworks are so awkward it is hard to place them on a leaf or anything but the will try to wiggle themselves free and if they are close to the screen they will latch right on.