Wayne Carlton's Calls 70168 Whispering Cow Call Open Call Cow Sounds Attracts Elk Natural Walnut/Maple The Whispering Cow Call is an open-reed elk call with a silencer cap that creates soft mature cow moos and bleats for coaxing bulls in close. It has a new adjustable notched frame for setting the desired sound without accidental movement. With a custom walnut-and-maple wood barrel with textured elk antler design. Includes lanyard.