The Gran Chaco is the least-known part of Argentina which has the reputation of being a land of Pampas, although these grassy plains cover but one-fourth of the total area of the Republic. In the Chaco are to be found the great majority of the flora and fauna which occur in Argentina, for except in its semi-tropical forests there is no considerable variety of either vegetable or animal life. Concerning the origin of the name, the worthy Padre Lozano says[150]: "The Etymology of the name _Chaco_ indicates the great multitude of tribes which people this region. When the Indians go out hunting and drive together from different quarters the vicunas and guanacos, that vast mob of animals is called _Chacu_ in the Quichoa language which is the common tongue of Peru. Thus, because the land in question contained a number of different tribes, they received by analogy the name _Chacu_, which the Spaniards have corrupted into _Chaco_." Since the early wars of the Spaniards with the various tribes this magnificent territory has not figured much in the history of the country, but in natural interest it surpasses every other part of the Republic, and its potential wealth is enormous. The climate, though tropical, is not oppressive, and although the country is subject to periodical floods, these greatly increase the natural wealth of the soil, and almost every kind of vegetable product can be grown. The principal tribes which inhabit this undeveloped region are the Matacos, the Tobas, the Macovies, the Vilelas, the Chinipies, and the Payaguas. Of these the Matacos and the Tobas are the most numerous. The Matacos are tall and bony with strong frames. They have prominent cheek-bones and black, hairy skins. Their teeth are white and far apart, their noses are flat. They cultivate the ground and raise crops of maize. The Tobas, who used to be a warlike race, are more prepossessing in appearance and are slightly more civilised. [Illustration: CHIRIGUANOS AND MATACOS.] In the Chaco there is a considerable variety of fauna. The most savage beast of South America, the jaguar, is found in Riacho Ancho and on the islands of Cerrito. Its ferocity and cunning are well known, and it is very destructive both to men and cattle. The puma also belongs to the feline race, and is also destructive.[151] The wild cat (_felis Geoffroyi_) is common. A less familiar animal is a large fox (_canis jubatus_), red in skin and not unlike a hyena in both appearance and habits, for it feeds on carrion. The tapir is one of the ugliest of living creatures. It belongs to the hog family and somewhat resembles the wild boar, but its long snout and ugly dark skin give it an insignificant appearance. It is not savage. There are numerous species of deer and a great variety of small animals. The alligator is very common. The fish of the rivers is good and plentiful, and the chief varieties are the pacu, armado, raya, suruvi, bagre, and palometa.