Primos Hunting Calls Buck Roar. The Primos Buck Roar is the most effective deer call since the CAN. The Primos Buck Roar sounds like a deep resonating growl that is made by agressive bucks during rut. Bucks make the "roar" when they are trying to get an Estrus Doe to stop or to warn other bucks to get away from a HOT doe. The Primos Buck Roar calls also features a snort,wheeze call to give you the extra edge during the rut. Comes with instruction DVD.