Human beings share the planet with many different organisms with vastly diverse ways of life. We like to think we're a higher form of intelligence. But are we really that unique? How different are we as a species when it comes to language, thought, and culture? Where does our specifically human form of consciousness come from? And if other animals are so similar to us, should we stop eating them? The Philosophers walk the Earth with Peter Godfrey-Smith from the University of Sydney, author of Living on Earth Forests, Corals, Consciousness, and the Making of the World.