I don't support the group that put on this presentation, and their purpose is not to show intelligent design of biological systems. Nevertheless, the following video provides some interesting insights. The video is mostly about the communication that bacteria use to communicate both within and among species of bacteria. The video also explains, however, a very special system in a certain variety of squid that relies on bacteria to help the squid operate in a sort of stealth mode. It is really quite fascinating:
It seems self-evident to me that the squid and the bacteria are designed, not simply the result of chance. I realize that people will disagree, but I don't think it's because the evidence is not clear enough.
Hat tip to Dr. James White for bringing this to my attention.