Quote Originally Posted by Srt_529 View Post
I dont know. hes not to far from my bed so i can see him and his mouth was alittle open. Hes moving around alittle like exploring because i put new fake plants. He made the noise a few times already and it looks like hes going to shed pretty soon. ( hes dull and eyes changed color so i raised his humidity to 60-70%.
Funny story - when I figured out where my snake's digestive noises were coming from, they also had their mouths open. It looked completely uncomfortable. It's like they had to open themselves up completely in order to avoid a pressure vacuum or something.

Since he's close to shedding, it could certainly be a piece of loose skin in his nose causing him to whistle a bit. That'd be perfectly normal too.