Guaycurus
GUAYCURUS, a tribe of South American Indians on the Paraguay. The name has been used generally of all the mounted Indians of Gran Chaco. The Guaycurus are a wild, fierce people, who paint their bodies and go naked. They are fearless horsemen and are occupied chiefly in cattle rearing.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)