At 100 grams I would say you could feed larger prey, fuzzies or even hoppers if they're on the smaller side. With juvenile Kings I always shoot for prey that leaves a slightly noticeable lump in the snakes stomach.
Kings have voracious appetites and would eat more, I'm sure. In the case you mentioned in the wild, they would likely gobble up all they can, because they are opportunistic feeders not knowing when their next meal will come. In captivity, we have the luxury to feed them weekly, so we can regulate their intake and feed on a healthier schedule.
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