Eagle's head, from pipe, as it would appear on a flat surface. (Full size.)
Moore, Clarence B. (Clarence Bloomfield), 1852-1936 (contributor)
Full size drawing of an eagle's head from a pipe of limestone excavated at Moundville, Alabama. Figure 86 in the article Moundville Revisited by Clarence B. Moore published in the Journal of the Academy of Natural Sciences of Philadelphia.