by chimpanzees probably means that early humans used wooden spears as well, perhaps, five million years ago. The earliest dated find of surviving wooden hunting spears dates to the very end of the Lower Paleolithic, just before 300,000 years ago. The Schöningen spears, found in 1976 in Germany, are associated with Homo heidelbergensis. The hunting hypothesis sees the emergence of behavioral modernity in the Middle Paleolithic as directly related to hunting, including mating behaviour, the establishment of language, culture, and religion, mythology and animal sacrifice. Sociologist David Nibert of Wittenberg University argues that the emergence of the organized hunting of animals undermined the communal, egalitarian nature of early human societies, with the status of women and less powerful males declining as the status of men quickly became associated with their success at hunting, which also increased human violence within these societies. However, 9000-year-old remains of a female hunter along with a toolkit of projectile points and animal processing implements were discovered at the Andean site of Wilamaya Patjxa, Puno District in Peru. Upper Paleolithic to Mesolithic Evidence exists that hunting may have been one of the multiple environmental factors leading to the Holocene extinction of megafauna and their replacement by smaller herbivores. North American megafauna extinction was coincidental with the Younger Dryas impact event, possibly making hunting a less critical factor in prehistoric species loss than had been previously thought. However, in other locations such as Australia, humans are thought to have played a very significant role in the extinction of the Australian megafauna that was widespread prior to human occupation. Hunting was a crucial component of hunter-gatherer societies before the domestication of livestock and the dawn of agriculture, beginning about 11,000 years ago in some parts of the world. In addition to the spear, hunting weapons developed during the Upper Paleolithic include the atlatl (a spear-thrower; before 30,000 years ago) and the bow (18,000 years ago). By the Mesolithic, hunting strategies had diversified with the development of these more far-reaching weapons and the domestication of the dog about 15,000 years ago. Evidence puts the earliest known mammoth hunting in Asia with spears to approximately 16,200 years ago. Many species of animals have been hunted throughout history. One theory is that in North America and Eurasia, caribou and wild reindeer "may well be the species of single greatest importance in the entire anthropological literature on hunting" (see also Reindeer Age),