The eating of human flesh by men. This is done either out of dire need or for ritual purposes, when parts of deceased relatives or enemies may be eaten so that their power can be magically acquired. Disarticulated bones of humans, as well as animals, have been found in the ditches of Neolithic camps, which is thought to be suggestive of cannibalism. Its existence in Paleolithic cultures is suggested by the lengthwise splitting of long bones so as to extract marrow from them. In Mesoamerica, there is evidence among hunter-gatherers at start of Holocene through the 1st millennium BC in farming villages. There were many written documents concerning cannibalism from the Aztecs of the 15th century AD. To the Aztecs, the human flesh sacrificed and offered to the gods became a sacred food.