An understanding of human nature has been central to the work of some of the greatest philosophical thinkers including Plato, Descartes, Hume, Hobbes, Rousseau, Freud and Marx. Questions such as 'what is human nature?', 'is there such a thing as an exclusively human nature?', 'through what methods might we best discover more about our nature?', and 'to what extent are our actions and beliefs constrained by it?' are of central importance not only to philosophy, but to our general understanding of ourselves as part of the human species. This volume addresses such questions through the inclusion of special commissioned essays by specialists including John Cottingham, Hans-Johann Glock, P. M. S. Hacker, Wolfram Hinzen, Rosalind Hursthouse, Peter Kail, Sarah Patterson and Richard Samuels.