A metaphor for the polar opposites of technology vs nature. Caged tribe represents the modern technological civilization, and is trapped by their own machinations. Reptile tribe represents the law of the jungle, of a society living in ignorance of higher things. In simple words, the song is asking whether the two different types of cultures can be merged or integrated together in order to transcend both. To further explore what is meant by the song, you could compare and contrast the overall message to say the Nietzchean duality of the Apollonian and the Dionysian, or the Jungian dual archetypes of Ego and Shadow.