Houston Zoo 2017 with the Bigger Cahoona - Rattles of a Rattler

Not the business end, but one of the more interesting parts of this family of snakes.  So effective that many other species have evolved to mimic the sound by rattling their tails in dry leaves - namely coachwhips, king snakes and some of the rat snakes found here in southeast Texas, all of which I owned at one time or another as a kid growing up.