▁called ▁an ▁internal ▁wall , ▁sto pper , ▁b aff le , ▁or ▁partition ) ▁inside ▁the ▁instrument ▁separ ates ▁the ▁slow ▁air ▁chamber ▁from ▁the ▁sound ▁chamber . ▁ ▁The ▁block ▁on ▁the ▁outside ▁of ▁the ▁instrument ▁is ▁a ▁separate ▁part ▁that ▁can ▁be ▁removed . ▁The ▁block ▁is ▁also ▁called ▁the ▁bird , ▁the ▁fet ish , ▁the ▁s addle , ▁or ▁the ▁to tem . ▁The ▁block ▁is ▁tied ▁by ▁a ▁st rap ▁onto ▁the ▁nest ▁of ▁the ▁fl ute . ▁The ▁block ▁moves ▁air ▁through ▁a ▁fl ue ▁( also ▁called ▁the ▁channel , ▁fur row , ▁foc using ▁channel , ▁thro at , ▁or ▁wind way ) ▁from ▁the ▁slow ▁air ▁chamber ▁to ▁the ▁sound ▁chamber . ▁The ▁block ▁is ▁often ▁in ▁the ▁shape ▁of ▁a ▁bird . ▁ ▁Note ▁that ▁fl utes ▁of ▁the ▁Mi ' k ma q ▁culture ▁are ▁typically ▁constructed ▁from ▁a ▁separate ▁block , ▁but ▁the ▁block ▁is ▁perman ently ▁fixed ▁to ▁the ▁body ▁of ▁the ▁fl ute ▁during ▁construction ▁( typ ically ▁with ▁gl ue ). ▁Even ▁though ▁these ▁fl utes ▁do ▁not ▁have ▁a ▁mov able ▁block , ▁they ▁are ▁generally ▁considered ▁to ▁be ▁Native ▁American ▁fl utes . ▁ ▁The ▁precise ▁alignment ▁and ▁longitud inal ▁position ▁of ▁the ▁block ▁is ▁critical ▁to ▁getting ▁the ▁desired ▁sound ▁from ▁the ▁instrument . ▁The ▁longitud inal ▁position ▁also ▁has ▁a ▁mod est ▁effect ▁on ▁the ▁pitch es ▁produced ▁by ▁the ▁fl ute , ▁giving ▁the ▁player ▁a ▁range ▁of ▁roughly ▁ 1 0