You can find vendors online that will sell rabbits from stillborn kits up through 10 lbs. My adult females eat 6-8 oz rabbits at most, the same size as an XL rat, once every month. Over the winter they get less.
If you are feeding colossal rats which likely weigh a pound or more then your snake should only be eating every 6-8 weeks, not every 12 days. Keep that up and your snake will become obese and die.
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