Copy drawing in graphite and colored pencil of the Thunderbird within an arc of lightning.Koba, 1848-1880circa 1878-1880spaDrawing attributed to Etahdleuh Copied from a muslin war cape painted by Black Chicken (also known as Siyo Sapa, Sayosapa, and Black Prairie Chicken), a Yanktonai Indian, circa 1870-1880, and formerly in the collection at the United States Indian School