Abstract
Conscious beings are efficacious and that is how we can know where they exist. They are able to sense their environment and interact with it in a dynamic flexible goal oriented way. They interact with their immediate surroundings in their own characteristic manner. They are self movers but require the use of energy to move. Where would we find such fundamental mental beings, monads or natural individuals? I use science to speculate as to the answer to that question and arrive at some surprising conclusions. The fundamental subjective beings exist at the level of elementary particles and animals with nervous systems but also at two intermediate levels within the living Earth. I conclude that on planet Earth there is a four level hierarchy of natural mentality.