This is Narjak wiht his mouth opened, all of it's mandibles outstreched and really to pull in its unfortunate prey. Also, as a bonus, I included a minifigure for an idea of how big this guy is.

Narjak's shell is tough and structurally sound for a good reason: within its gut lies the entrance to an endless void, keeping the creature constantly starved and agitated. It constantly eats without stopping and refuses to let anything get away. It is said that if Narjak was given the time, he'd eat the entire surface of the planet layer-by-layer until nothign is left.

So, yeah....THAT'S why the vore guys would like him XP