DuckFan

Don't let the wooden manner or eyeless visage fool you into thinking that this fuliguline fellow serves little or no purpose, for in place of the seemingly innocuous grouping of feathers that would constitute the tail, there lies a vertiable vorpal blade.

A relative of the pin-tail you might think, and with some reason. Every day he tirelessly employs his ensiform caudal appendage to devastating effect, wreaking havoc on envelopes that seem to fly at him from far and wide. Having dispatched all comers, he retires to his former placitude. Though as yet undefeated, he lives in apprehension of fibreglass-tape, that unnatural substance with which he once had an unexpected encounter. The attempt on his dignity left him scarred and deformed, but he assures me that his resolve has never been stronger.