<P> The third section of the park is located on the west side of the second and was inaugurated in 1974 . It has a surface area of 242.9 hectares . It is the least developed and least visited; it is filled with trees and wildlife . Although some recreational activities such as archery and horseback riding are practiced there, the importance of this area is primarily as an ecological preserve for various species of flora and fauna, such as snakes and lizards . In 1992, it was decreed as a Protected Natural Area . In 2010, there were reports of feral dogs attacking visitors in the third section . Approximately 150 feral dogs were living in the small canyon areas of this section that year . </P> <Table> <Tr> <Td> </Td> <Td> This article needs to be updated . Please update this article to reflect recent events or newly available information . (October 2017) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs to be updated . Please update this article to reflect recent events or newly available information . (October 2017) </Td> </Tr> <P> According to archeological studies, there has been human presence in the area since at least the pre-Classic period . The first identified culture archeologists have evidence for is the Toltecs . The Toltecs named the area "grasshopper hill", which would later become "Chapultepec". Remains of a Toltec altar have been found on the hill's summit . In the Classic Period, the area was occupied by people of the Teotihuacan culture . When the Mexicas, or Aztecs arrived in the Valley of Mexico, it was inhabited by a people called the Tepanecas of Azcapotzalco . </P>

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