:: Rothe et al (2008) associate Pepi II Neferkare with the Ipuwer Papyrus when they write and I quote, "There are many petroglyphs which depict ostriches and a few that depict giraffes. Butzer (1961) has used relative frequencies of the appearance of these animals in petroglyphs to gauge the changing climate. This evidence fits well with the three OK inscriptions, at least one of which is from the reign of Pepy II, which tell of digging wells (inscriptions DN28, ML01, ML12). While it is possible that these people could be simply pioneering a new route, it seems more likely that the old sources of water were drying up. Additional weight is given to the latter argument by a passage from a document known to Egyptologists as the 'Admonitions of Ipuwer,' which described conditions during the First Intermediate Period."  Rusell D. Rothe, et al., Pharaonic Inscriptions From the Southern Eastern Desert of Egypt, Eisenbrauns, 2008