This tribe is numerous, wild, fickle, easy to reduce, [138] somewhat difficult to preserve, and suspicious and treacherous in their attacks. They build their houses near the rivers and often in the forks of trees. Their religion is very like that of the Mandayas. They annually change their abode in order to make new fields, being compelled to do so because of the grass and briars which spring up. As they have no means for the deep working of the soil, consequently permanent possession has no charm for them. They abandon their houses as soon as anyone dies in them, and if the deceased is an outsider, they demand the worth of the abandoned house from his relatives. Their system of life is the patriarchal, under the protection of their respective bagani. The Manobo, according to Dr. Montano, [139] presents two extreme types: one athletic, and of much slighter build than the other. Those two types combined in the majority of the individuals constitute another medium type whose characters are more plainly marked in the Manobos of Dávao, than in those of the Agúsan. Their clothing, weapons, and ornaments closely resemble those of the Mandayas, with the exception of the strings of glass beads, which are black rather than red among the Manobos. Tattooing is practiced among the Manobos, and is done by means of a needle and powdered charcoal. The number of the Manobos in the valley of Agúsan is about 20,000, half of whom are now reduced. The number of those of the district of Dávao and Cottabato is unknown. The Mandayas (man-daya, "people of the upland"--ilaya) is a tribe extending from Tago to Mati, and from Gandía to the source of the Agúsan, and in the district below the Sálug, as may be seen at color no. 34, of the adjoined ethnographical map. The manners and customs of the Mandayas are described in a letter written by Father Héras, June 8, 1878. The Mandayas number about 30,000 of whom 8,000 are already reduced and baptized. The Manguangas [140] (man-gulangas, "people of the woods") live on the upper part of the Sálug. They are warlike and have continual quarrels with the Manobos and Mandayas of the Agúsan, the Moros of the Hijo, and the Atás. They are easy to reduce. In the map, they occupy the place corresponding to color no. 5. The Monteses (Buquid-non) [141] of the second district of Mindanao are divided into two groups: those adjacent to the Manobos of the Agúsan between Gingóog and Nasípit, who approach to the habits, and the social and religious life of the latter; and those who people the mountains and valleys of the Tagalóan River. Comprehended in the parish of Balingasag, there are several reductions of them. Their number is about 4,000. They are shown in the map at color no. 6.