I'm kinda going out on a limb here and asking if snakes emit flatulence(ie, fart).
A few minutes ago I was busy reading the news and all of a sudden I heard the loudest squeaking sound coming(but brief) from my BP's tank. It startled the crap out of me, seeing that I'm alone in my bedroom at 3am with the lights off in complete darkness.
It does also make a bit of sense, considering he's very bloated after eating a rat on the larger side.