If she’s on adult mice and you want to feed her rats instead she should be having a rat pup or weaned rat. Not a young adult rat. Another way you could try to heat the prey up is under a heat lamp, I let my rats thaw out in the fridge over night then stick them under a heat lamp until they’re up to temp and offer. The only problem with that is the rats could explode but I’ve heard that also can happen when you thaw in water too
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