I'm learning that too, about my two BP's. They go on feeding strikes and are picky, then one day they are really really hungry, then the next feeding they aren't anymore.
I was so stressed about my one that went on an 8 month feeding strike (she's an adult). Now she will eat a rat that's been left in her cage even if it's cold and stiff after being rejected by my other BP-- they seem to take turns being picky.
As long as there's nothing else wrong with them or their environment they'll just eat when they are good and ready.