Due to a lack of written records from this time period, nearly all of our knowledge of Paleolithic human culture and way of life comes from archaeology and ethnographic comparisons to modern hunter-gatherer cultures such as the !Kung San who live similarly to their Paleolithic predecessors.[16] The economy of a typical Paleolithic society was a hunter-gatherer economy.[17] Humans hunted wild animals for meat and gathered food, firewood, and materials for their tools, clothes, or shelters.[17] Human population density was very low, around only one person per square mile.[2] This was most likely due to low body fat, infanticide, women regularly engaging in intense endurance exercise,[18] late weaning of infants and a nomadic lifestyle.[2] Like contemporary hunter-gatherers, Paleolithic humans enjoyed an abundance of leisure time unparalleled in both Neolithic farming societies and modern industrial societies.[17][19] At the end of the Paleolithic, specifically the Middle and or Upper Paleolithic, humans began to produce works of art such as cave paintings, rock art and jewellery and began to engage in religious behavior such as burial and ritual.[20]
