The Lama, the Paco or Alpaca, and the Guanaco are three originally distinct species of animals.[FV] The Guanaco (Huanacu in the Quichua language) is the largest of the three, and the Alpaca, measured from the ground to the crown of the head, the smallest. The Lama is next to the Guanaco in height. Herds of Lamas, when as numerous as I have seen them on the elevated plateaux between Quito and Riobamba, are a great ornament to the landscape. The Moromoro of Chili appears to be a mere variety of the lama. The different species of camel-like sheep found still wild at elevations of from 13,000 to upwards of 16,000 feet above the level of the sea, are the Vicuña, the Guanaco, and the Alpaca; of these the two latter species are also found tame, although this is but rarely the case with the Guanaco. The alpaca does not bear a warm climate as well as the lama. Since the introduction of the more useful horse, mule, and ass (the latter of which exhibits great animation and beauty in tropical regions), the lama and alpaca have been less generally reared and employed as beasts of burden in the mining districts. But their wool, which varies so much in fineness, is still an important branch of industry among the inhabitants of the mountains. In Chili the wild and the tame guanaco are distinguished by special names, the former being called “Luan” and the latter “Chilihueque.” The wide dissemination of the wild Guanacos from the Peruvian Cordilleras to Tierra del Fuego, sometimes in herds of 500 heads of cattle, has been facilitated by the circumstance that these animals can swim with great facility from island to island, and are not therefore impeded in their passage across the Patagonian channels or fiords.[FW] South of the river Gyla, which together with the Rio Colorado pours itself into the Californian Gulf (Mar de Cortes), lie in the midst of the dreary steppe the mysterious ruins of the Aztek Palace, called by the Spaniards “las Casas Grandes.” When, about the year 1160, the Azteks first appeared in Anahuac, having migrated from the unknown land of Aztlan, they remained for a time on the borders of the Gyla river. The Franciscan monks, Garces and Font, who saw the “Casas Grandes” in 1778, are the last travellers who have visited these remains. According to their statement, the ruins extended over an area exceeding sixteen square miles. The whole plain was covered with the broken fragments of ingeniously painted earthenware vessels. The principal palace, if the word can be applied to a house formed of unburnt clay, is 447 feet in length and 277 feet in breadth.[FX]