From Flambeau's MAD Series, the Hyper Growl Deer Call takes the next new step in deer call innovation by emulating the actual way that deer produce sound. The addition of a "Hyper Ventilator Tube" to the air passage-way, simulating a deer's nasal passage or nostrils, creates the most realistic deer sounds ever recorded and a reed system that cannot be locked up with as much air flow as you can give it.