  Cooperation and competition among stand-alone swarm agents increase
collective fitness of the whole system. A principally new kind of collective
systems is demonstrated by some bacteria and fungi, when they build symbiotic
organisms. Symbiotic life forms emerge new functional and self-developmental
capabilities, which allow better survival of swarm agents in different
environments. In this paper we consider energy foraging scenario for two
robotic species, swarm robots and symbiotic robot organism. It is indicated
that aggregation of microrobots into a robot organism can provide better
functional fitness for the whole group. A prototype of microrobots capable of
autonomous aggregation and disaggregation are shown.
