That's normal & that's what most snakes do- they stay in "feed mode" for a while after eating (for hours or a day+). Doesn't mean their prey was too small- it's just like when we humans eat rather fast & keep going for dessert or seconds before we realize we over-ate. It takes a while for the stomach (human or reptile) to tell the brain that's quite enough.
If you give in to the notion that it's not enough food, your snake may end up overweight & unhealthy, & the same goes for us. It's your snake & you're in charge of his health & longevity.
Also, large mice are more fatty (less healthy) for snakes (they're retired breeders) so a better choice is a small rat, & nothing larger than that for adult male BPs. Unless you enjoy wasting food when they start fasting? Male BPs fed larger than small rats are more likely to go on long fasts, because at some point even their body knows when it's too much food. (Female BPs grow larger for breeding & can take up to medium rats, but the males stay smaller.)
Were you asking for how to change over from mice to rats? He may take it right off- try & see. Otherwise, feed him a SMALL mouse as an appetizer, & follow it right away with a very small rat, so he learns to accept the taste difference.









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