Darwin and the evolution of why?
Summary: We human beings are the only living things that can represent, transmit and criticize reasons for doing things and making things. This creates a perspective for us that we can then use to interpret all the rest of the life on the planet, cautiously. Mother natures reasons are not just like our reasons. It is our evolved capacity to ask, and answer, Why questions that gives us, in the end, the kinds of free will worth wanting, the kinds that no other animal has.
Professor Daniel C Dennett (Centre for Cognitive Studies, Tufts University, Medford, Massachusetts, USA)