The principal tribes are the Quijos or Canelos, who are settled about the headwaters of the Napo, on the eastern slopes of the Andes, and are in great part grouped about the missions; the Jivaros who inhabit the valley of the Pastaza; the Zaparos who occupy the forest region between the Pastaza and Napo; the Piojes of the middle Napo, and eastward to the Putumayo; and the Iquitos and Mazanes of the lower Napo and Tigre, chiefly in territory occupied by Peru. The Jivaros are the best known of these tribes because of their successful resistance to the Spanish invaders. They are still independent of political control, live in permanent settlements, till the soil (producing Indian corn, beans, yucca and plantains), and have developed some rude manufactures. The Zaparos are less homogeneous, some of their hordes living in a state of complete savagery. They are classified with the Guaranis of Brazil, whom they resemble in many particulars. The Piojes live in permanent communities and cultivate the soil. The total number of "aucas" or uncivilized Indians in the republic has been estimated at about 200,000, but this estimate covered a larger area than Ecuador actually occupies and is evidently too high. Their settlements are usually small and very much scattered, and their aggregate number is evidently much under the earlier estimates. An official estimate given to Mr Whymper in 1880, however, places the population of Oriente (the eastern territory) at 80,000, which is probably more nearly correct.