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Copper plate of bird-man or falcon dancer from Dunklin Missouri. Note the barred wing-feather cape.
Fowke, G. 1910 Antiquities of Central and Southeastern Missouri. Bureau of American Ethnology 37, Washington DC. See also O'Brien, P. J. 1994. Prehistoric Politics: Petroglyphs and the Political Boundaries of Cahokia. Gateway Heritage 15(1):30-47. (O'Brien 1994; p.44)