Waist-length portrait of Shakoka, seated, wearing beaded necklaces and earrings. Her untied grey hair features prominently in the portrait., In Prichard, James Cowles. The natural history of man (London, 1843), plate following p. 402., "Dr. Prichard’s Natural History of Man”., The distinctive physical features of the Mandan Indians - such as the prevalence of grey hair and variety of skin tones within the tribe - led Dr. James Prichard to include several of George Catlin’s portraits of Mandan Indians in his own anthropological works.
