As civilizations have formed around the world, it is easy to think that the one we are part of, which has most of its roots in England, is the way of life that should be regarded as "normal". This is because we rationalize and assume that 'since I am doing it, and the people around me are doing it' it must be the right thing to do. This comes from the natural human instinct to conform to social norms, because in our subconscious, we find that this is a necessary tool for survival and it will enable us to pass our genes on to other generations. For example, I was a caveman in the BC's travelling across snowy plains with my tribe, or what have you... It would be wisest to stay together and to do what other people are doing. If i strayed off on my own, and started having my own agenda, this would certainly lead to my death because it would mean I would have no support since i decided to not stay together. This remains a core trait of human beings today. With indigenous cultures, many aspects of their daily life are very different to our own because, how we have carried out our lives has absolutely no influence on how they have. Indigenous cultures are simply learning from their own experiences and have adapted to their surroundings as well as they could.
In Tibet, bodies of those that have passed away are cut in various places and laid on a mountaintop where it is exposed to the natural elements of nature, including animals. The ritual signifies the fleetingness of life and is considered to be a generous act, and a balance of nature as it provides food for the animals, as animals have provided food for humans. The ritual to me is understandable and brings to mind, Ying-Yang.
"The soil is eaten by the worm, the worm is eaten by the bird, the bird is eaten by the snake, the snake is eaten by the leopard. When the leopard dies, it goes back to the soil. Such is the nature of nature." -African Proverb