Note: Do not rely on this information. It is very old.
Mocobi
Mocobi, a warlike South American nation, who still maintain their independence in the Argentine provinces of Gran Chaco and Santa Fe; they are hereditary foes of the Tobas, although both of these powerful nations have a common origin and speak dialects of a common stock language. By Brinton (American Race) they are regarded as members of the Guaycuru family.