During the latest Pleistocene and early Holocene, the first humans arrived on the Andean high plateau at above sea level. They settled in caves and rock shelters in various locations on the Altiplano and had a hunter-gatherer lifestyle. The main ingredient of the early diet existing until colonial times was white tailed deer ("Odocoileus virginianus"). Fishing in the many lakes that existed in those times was another source of food for the people.