There may also be more exotic possibilities, such as creatures made out of self-organising magnetic fields, or superconducting currents in the frigid regions of the comet cloud. One could, indeed, argue that there are some life-forms based on other elements here on Earth. Consider sand- dunes, for example. Each sand dune produced new sand dunes in its wake, as it deflects the air currents. These new baby dunes can grow and move away to start their own independent lives.
Sand dunes can merge and split, and in so doing can change their shapes, and produce new offspring.