Awareness of Death
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Humans have the ceremony of death regardless of cultural difference. Humans drop tears in front of the corpus. We hardly discovered this kind of behavior in the other animals. When did it start? The archaeological evidence of Neanderthal man shows the burial of their dead that could be ritual. The flower pollens could be a ritual burials. In some cases Neanderthal burials include bones and tools. The living animals also show the special behavior to the corpus. Chimpanzees, especially in a certain community in Guinea, keep the corpus of her dead infant for a long time.
Tool use for corpse cleaning in chimpanzees, , Scientific Reports, 2017/03/13, Volume 7, p.44091 - , (2017)
Chimpanzees' responses to the dead body of a 9-year-old group member., , Am J Primatol, 2016 May 9, (2016)
Wild American crows gather around their dead to learn about danger, , Animal Behaviour, 11/2015, Volume 109, p.187-197, (2015)