[quote=Catharyn]
Defense, i was toying with the idea of some kind of sonic boom emitted from the mouth? Designed to stun, disorientate and incapacitate but not necessarily kill.
[/quote]

You know what you could use for that? Take the Snapping Effect of Alpheidae shrimp to a whole new level. Some muscle in the mouth that produces the same effect but projects it?