After a couple of hours of walking, I had got quite deep inside the mountain. I could no longer hear any sound from the civilisation. No sound from the surrounding roads, only the sound from my feet as I was walking, and from the grasshoppers jumping from one fallen leaf to another to avoid my feets. It was the silence of Nature and piece in my mind. How wonderful. Until I met the deadly Amur Viper. The snake was lying straight across the path along which I was walking. It was huge, more than 100 cm long, and very thick, perhaps 10 cm thick. It was sunbathing on the top of the mountain hill along which the walking path went, perhaps right after having had some late breakfast or brunch. These snakes avoid the noise from our civilisation. They can not be found anyplace where one can hear the sound from the roads. The only chance to find them, is by going outside the noise region from our civilisation. Is it natural for humans to expose themselves to the noise from our civilisation, or is it more natural for us humans to also behave like the Amur Vipers do? At some point in ancient history, as our intelligence developed, I suspect that humans started to abandon some of their natural instincts.