User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5020152-20121001195238/@comment-5043481-20121002203446

Could be, but then the bellows would have to be on either side. That would work actually. A long barrel sticking out its back would be vunerable.

The thing about peristalsis is that it is very strong but not fast. The rocks would simply not be able to be expelled fast enough. It would also injure the inside of the creature if it fired something hard. If you don't belive me go eat a pebble.

Making the peristalsis stronger would make it faster, but a whoomf from behind would be more efficent and faster.