The sound of a grunting buck can send a shiver of anticipation up any hunter's spine. What was a calm sit in a tree stand can quickly become an adrenaline rush of epic proportions. Whether it's a low tending vocalization to a nearby doe, or something more aggressive toward another buck (whether seen or unseen) in the area, that tell-tale "urp!" coming from a wooded bottom or a cruising bruiser is...