wow now this is interesting i have never ever known this and ive kept my corns for 9 years now. LOL. i have never witnessed any of them opening their vents for anything except when they poop, when i smell in their vivs the only thing i smell is the substrate and i do sniff my snakes, LOL, i actually stick my nose right up against them and smell but they only smell of their substrate, not once have i ever smelt anything bad about them, again though, only when they poop, thats when i open their vivs and i get knocked back by the stench, hehe, my male is now 5 foot 10 inches, hes pretty big therefore has big poop. lol. ok wont gross any of you out anymore, definitely interested me though, will be watching like mad now next time they are out.