I've found the best way to thaw out the rodents is to leave them in the fridge overnight, then run hot water over them until they're warm to the touch. Running the hot water over them first may be weakening the cell walls in the abdomen, which will cause a burst belly. Few years of thawing out hundreds of pinkies and fuzzies a week taught me to leave them out in the fridge and then run warm, and then hot, water over them. Too much heat too fast and you end up with mouse innard soup, a concoction guaranteed to make new employees vomit.
In any case, try thawing slower, using the hot water only to make the rodent warm all the way through.
-Jen
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