In A Darwinian Left, Peter Singer argues that the political left has misunderstood Darwinian ideas and as a result been hostile to the application of Darwinian thinking to politics.

Although the distinction between the politics of the left and the right is commonly assumed in the media and in treatments of political science and history, the terms are used so loosely that the student and the general reader are often confused: What exactly are the terms left and right supposed to imply?