Honestly, corn snakes don’t get big enough to really need anything other than mice. The appropriate sized mouse would also have better nutrition (because better developed bones) than the appropriate sized rat. I would just stick to mice and not stress him with rats. Especially since they are basically the same thing, just in different sizes. If you want to mix up his food (they primarily eat rodents in the wild) and have it be for a different kind of nutrition, try to get him to take quail chicks. You could also get some reptilinks.
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