For us humans, I find it interesting that our bodily defense against microscopic enemies (our highly complex immune system) doesn’t appear to be self-aware even though our defense against macroscopic enemies (our brain controlling various muscles) does. This is presumably because the aspects of our world that are relevant in the former case are so different (e.g., smaller length scales, longer time scales) from that of the latter that sophisticated, logical thinking and the accompanying self-awareness aren’t needed.
