The first human presence in Mesoamerica is documented around 8000 BCE, during a period referred to as the Paleo-Indian. Linguistic data, however, including language reconstruction derived from the comparative method, do not reach further back than approximately 5000 years (towards the end of the Archaic period). Throughout the history of Mesoamerica, an unknown number of languages and language families became extinct and left behind no evidence of their existence. What is known about the pre-Columbian history of the Mesoamerican languages is what can be surmised from linguistic, archeological and ethnohistorical evidence. Often, hypotheses concerning the linguistic prehistory of Mesoamerica rely on very little evidence.