http://newenglandreptile.com/webpics/scary1.jpg
You can see the glottis closed on the floor of her mouth - that's the windpipe that allows snakes to breathe even while consuming large prey items. Here's a pic with the glottis open:
http://newenglandreptile.com/webpics/scary2.jpg
That's "Scary" - a 20'+ Malaysian silver retic. Some of you may also recognize her from this pic:
http://newenglandreptile.com/webpics/scaryeye.jpg
Enjoy!
K