 However, with the benefit of several decades of subsequent research, Laylander (1997) and Zamponi (2004) conclude that the languages were unrelated.The Pericú may have shared with the Waikuri distinctive physical characteristics such as small bodies and dolichocephalic crania (long-headedness).Those physical characteristics set them apart from most other Native Americans and are consistent with the theory that they were an ancient people and their language was a language isolate of ancient origin.