[1] Whistled language occurs among the Kickapoo Indian tribe living in the Mexican state of Coahuila.
[2] The system of whistling was employed around 1915 by young members of the Kickapoo tribe, who wanted to be able to communicate without their parents' understanding.
To alter the pitch of their whistle, the Kickapoo Indians lift their fingers from the back of the chamber.
[2] Among the Kickapoo Indian tribe, whistled speech is employed primarily for courtship purposes.
Young men and women rendezvous using whistle speech each evening as a cultural tradition.