1 Peccary, of which two species occur, the collared (Pecari tajacu = Tayassu tajacu) and the white-lipped (Tayassu pecari). Adult weights average 16-30 kg. The New World peccaries are classed with Old World pigs (Suidae) in the suborder Suiformes, but in a separate family (Tayassuidae). They are distinguished primarily on the basis of details of foot structure (Walker 1968, 11:1365-1366). Peccaries are gregarious. medium to large nonruminant ungulates. Collared peccaries typically occur in groups of 5-15 animals, while the larger white-lipped peccaries run in herds of 50-100. Both demonstrate close ecological and behavioral parallels to Old World pigs (Crzimek 1975, Xlll:106) Although the white-lipped peccary is an especially dangerous adversary, it is certainly no more so than the wild progenitors of the Old World domesticated hog (Sus scrofa). The white-lipped peccary is restricted to lowland forests, but the collared peccary is still a common animal nearly throughout Mexico. It was present and hunted in the Tehuacdn Valley (Flawery 1967) but is rare in archaeological sites in the Valley of Mexico (Sanders, Parsons, and Santley, The Basin of Mexico [New York: Academic Press]. 1979). It remains an important game species despite heavy human predation (Leopold 1972:497). Collared peccaries are also known to be easily tamed and to make excellent pets (Leopold 1972:496). Sahagun (1956, 111:227) describes a peccary as coyametl in Nahuatl.

2. Pronghorn antelope (Antilocapra americana). Adult weights average 36-60 kg. This distinctive New World antelope is the ecological counterpart of the Old World sheep (Ovis spp.) and goats (Capra spp.) (Leopold 1972:523). Ranging in large bands of up to 100 individuals, they occurred in historic times south to the very edge of the Valley of Mexico and before 7000 B.C. to the Tehuacan Valley (Flannery 1967). They were the subject of large-scale Indian hunting parties shortly after the Conquest (Leopold 1972:518). The "Chichimec" progenitors of the rulers of Tenochtitlan would have been very well acquainted with the habits and food potential of the pronghorn The species is well described in Sahagun (1956, 111:282); it was known in Nahuatl as tlamacazcamazatl (mazatl is the generic term for "deer"). Pronghorn hunting practices described for the Great Basin and Plains regions of North America emphasize the curiosity of the species, a behavioral trait that should have facilitated domestication. Although attempts to breed pronghorns in captivity outside their native ecological zone have met with limited success. they have been successfully reared within that zone (Crzimek 1975. Xlll:270)