 The lack of relationships between Guaycura and other languages indicates that Guaycura may have developed in isolation over a period of at least 5,000 years.At one time the Guaycura and Pericú may have occupied much greater territories but they were pushed southward and isolated by the expansion of the Cochimí people who spoke a language in the Yuman-Cochimí language family.There is no evidence that the Guaycura were ever united politically, but rather consisted of a large number of independent bands, each with their own territory and sometimes hostile to each other.