The native calibans are first presented as annoying lizard-like creatures constantly moving earth to make incomprehensible patterns. The humans at first attempt to keep them outside a perimeter or to drive them away. In time, larger and larger calibans are seen, with differences in color, size, and a social structure (gray calibans are subservient to the larger brown calibans). It becomes clear that the creatures are capable of communication, at least at the level of symbology, and of developing empathic or possibly telepathic links to humans. Eventually a symbiosis develops, with some of the calibans pairing off with humans.