In Rudyard Kipling’s famous story The Jungle Book, he depicts a young boy, Mowgli, living all alone in the middle of a jungle, working alongside the animals. In the story, Mowgli lives in a pseudo-society within the jungle, and the society is governed by the “Law of the Jungle." This law essentially is that of the animals, the strong kill the weak, and you will get retribution for the bad things you do.
It is a simplistic and animalistic idea that essentially just means nature is wild and dangerous. Mowgli learns to live in this environment and is able to survive in spite of these troubles. He is intelligent and resourceful, which keeps him safe, but the chaotic law of nature makes it a very dangerous place indeed.