The concepts of norm and nature form an important part of the categorical core of the moral world. The abundant literature on both of them testifies to their relevance. Here we are going to deal with the subject in two specific meanings: a) that of norm in the traditional sense of lex naturae and b) that of naturam sequi, imitating nature, a Stoic formula that has acquired notoriety in environmental ethics.Los conceptos de norma y de naturaleza forman parte relevante del núcleo categorial del mundo moral. De su relevancia da testimonio la abundante literatura que de ambas existe. Aquí nos vamos a ocupar del tema en dos acepciones específicas de las mismas: a) la de norma en el sentido tradicional de lex naturae y b) la de naturam sequi, imitar a la naturaleza, fórmula estoica que ha adquirido notoriedad en la ética medioambiental
