What is the theme in Mowgli's Brothers by Rudyard Kipling?

Nature versus nurture is a theme. The nature part of the story pertains to Mowgli's innate classification as a human. His body is human, hairless and upright. The nurture part of the story pertains to his learned traits and characteristics. His extended foster family teaches him everything he must know to be a wolf. He hunts when he is hungry; he sleeps in a cave with his family. Mowgli understands and lives by the Law of the Jungle. Mowgli's identity grows based on both his innate nature and the conditioning he receives from his surrogate family. Although he never breaks the Law of the Jungle, he continues to develop his prowess as a human being. This fact is evident in his ability to stare down any animal in the jungle. I