Some of them show this "hunting" behaviour after eating. It's just an instinct and doesn't mean that they're hungry or that they need more food.
Generally, they need to eat one food item at a time, which is no more than one and a half times their body width (look half way down the body, not at the head or neck). The food needs to leave a visible lump in their belly for 24-48 hours. If the lump goes down within 24 hours then it's probably time to try the next sized food up. Once they're on adult sized mice, they rarely need anything larger for the rest of their lives.
Remember that as you increase food size, you need to feed less often. That allows their digestive system to work properly and prevents them from becoming overweight. Once on adult mice, a Corn can be fed once every 7-21 days. I feed my adults every 14 days but a couple of males are inclined to fat and are fed once every 21 days.
It's very easy to overfeed a Corn in captivity. They will eat anything you give them, sometimes until they throw up. You need to regulate what they eat and not be tempted to feed on demand.
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