The development of ethical systems is intrinsically linked to the survival and evolution of social species. Peter Kropotkin, in Ethics: Origin and Development, posits that morality is not a divine imposition but a natural, biological phenomenon that arises from the necessities of social life. He argues that cooperation and mutual aid, rather than competition, are the primary drivers of societal progress and the foundation upon which ethical behavior is built. The book explores the origins of morality across different species and human societies, tracing its development from instinctual behaviors to complex social codes.

Published posthumously, Ethics: Origin and Development continues Kropotkin's exploration of social cooperation as a foundational element of morality. The work is recognized for its ambitious scope, tracing ethical development from natural instincts to complex social structures. It is often discussed in relation to Kropotkin's earlier work, 'Mutual Aid,' reinforcing his anarchist and mutualist perspectives on society. The book's arguments for a naturalistic basis of ethics have been influential in fields ranging from sociology to evolutionary biology.