This wind instrument can be found in Brazil in the state of Paraná, Santa Catarina or Rio Grande do Sul, there they perform blowing by the part of greater diameter and taking it with both hands forming an acoustic box in the part of where it is Tied a leash, so when blowing and moving hands vary the sounds produced.
Some blows may be; Direct as a Tuuuuuu, or also Trrrrrrr ....., Taka-Taka-Taka, etc.
Another way to run it is by vacuuming the smaller end producing another very interesting sound variety.
The whistle Duck has a strap to be able to hang around the neck.
The instrument can be blown gently or intensively achieving a wide variety of sounds.