We learned some signs common to the Plains tribes that goes back hundreds of years. This is how Drouillard (a member of the Corps) spoke to the Shoshone.
|MOON (Combination of sun sign, followed by hands going down, followed by crossed wrists)|
|HORSE (ignore pencil!)|
|MOUNTAIN (Start with hands into fists over head, then bring them down one to each side of chest, the move them forward very slowly)|