In 1540, Coronado reported that the modern Western Apache area was uninhabited, although some scholars have argued that he simply did not see the American Indians. Other Spanish explorers first mention "Querechos" living west of the Rio Grande in the 1580s. To some historians, this implies the Apaches moved into their current Southwestern homelands in the late 16th and early 17th centuries. Other historians note that Coronado reported that Pueblo women and children had often been evacuated by the time his party attacked their dwellings, and that he saw some dwellings had been recently abandoned as he moved up the Rio Grande. This might indicate the semi-nomadic Southern Athabaskan had advance warning about his hostile approach and evaded encounter with the Spanish. Archaeologists are finding ample evidence of an early proto-Apache presence in the Southwestern mountain zone in the 15th century and perhaps earlier. The Apache presence on both the Plains and in the mountainous Southwest indicate that the people took multiple early migration routes.