Abstract
It is argued that the opposition of nature and ethics ought to be overcome by the cooperation of scientific and ethical studies. Beyond that, theoretical, practical and specifically political reasons suggest a serious examination of the possibilities for an ethical orientation derived from evolutionary biology. So far, however, the conceptual connexion between evolutionary facts and ethical norms appears to be insufficiently understood. Given that, suggestive connexions offered by biological thinkers need critical examination, especially of their hidden historical conditions and their potentially dangerous political implications.